encryption presentation

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• Prof. Erik Demaine
• Prof. Srini Devadas
• Prof. Nancy Lynch

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• Mathematics

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Design and analysis of algorithms, lecture 22: cryptography: encryption.

Description: In this lecture, Professor Devadas continues with cryptography, introducing encryption methods.

Instructors: Srinivas Devadas

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Symmetric and Asymmetric Key Encryption – Explained in Plain English

Encryption is a way of scrambling data so that it can only be read by the intended recipient.

Encryption is an integral part of our daily lives – whether you are sending messages to friends on WhatsApp, visiting a website and your browser is making sure it's legitimate, or entering your bank details when buying something online. Encryption protects your data from potentially malicious and prying eyes.

This article will cover:

• Encryption algorithms and keys
• Symmetric and asymmetric key encryption
• How TLS/SSL uses both symmetric and asymmetric encryption

Encryption Algorithms and Keys

At the start of this article, I described encryption as a way of scrambling data so that it can only be read by the intended recipient. Let’s break down what this means.

Let's say you want to write a letter to your friend and want to ensure that only the friend can read its contents. How would you prevent the prying eyes of all the intermediaries the letter could pass through before it gets to your friend? That is, how do you prevent the postman, the concierge in their building, or one of their friends from reading the letter?

You start with an unscrambled letter that anyone can read. This is called plaintext . To scramble the contents of the message, you need an encryption algorithm and a key . The encryption algorithm uses the key to scramble the contents of the message. This encrypted message is called ciphertext .

The process of encryption is shown in the image below:

When your friend gets the message, they will need to descramble it using the algorithm and the key . This is illustrated below:

The two key ingredients needed to send a message to your friend that only they can read is an encryption algorithm and a key .

The encryption algorithm is simply a mathematical formula designed to scramble data, while the key is used as part of the formula. The encryption algorithm is generic, but the key, used as an input to the algorithm, is what ensures the uniqueness of the scrambled data.

Let’s look at one of the simplest encryption algorithms, called the Caesar Cipher. In its simplest form, this algorithm simply replaces each letter by the next letter in the alphabet. So A becomes B, and B becomes C and so on.

With this algorithm, the text ‘Birthday Surprise’ becomes ‘Cjsuiebz Tvsqsjtf’, indistinguishable from gibberish to the untrained eye.

With the Caesar Cipher example, the algorithm is the formula used to replace each letter of the alphabet with another. The key is the number of shifts made between each letter. With a key of 0, A is A, an obviously poor choice of key as the data is unscrambled. With a key of 1, A becomes B. With a key of 10, A becomes K.

The Caesar Cipher is a relatively poor encryption algorithm. Why? Since there are only 26 letters in the English language, you can only produce a maximum of 25 possible ciphertexts. If you don’t have the key, you only need to shift each letter up to 25 times until you see coherent words and sentences, at which point you know that you have successfully decrypted the message.

A bad encryption algorithm is one that is easily decrypted by using a small amount of brute force (that is, trying every possible permutation) – and 25 possible ciphertexts is an objectively small number of possible options to go through.

Modern encryption algorithms like AES-256 used by AWS, GCP, and Azure for encrypting data are considerably more complicated and secure than the Caesar Cipher. Based on current computing capability, it would take trillions and trillions of years for the most advanced supercomputer to use brute force to decrypt data encrypted using AES-256 [ 1 ]. Even the universe is not that old.

Symmetric and Asymmetric Key Encryption

The core of any encryption process is the encryption algorithm and the key. There are many types of encryption algorithms. But there are, broadly speaking, two types of keys – symmetric and asymmetric keys.

In symmetric key encryption, the same key used to encrypt the data is used to decrypt the data. In asymmetric key encryption, one key is used to only encrypt the data (the public key) and another key is used to decrypt (the private key).

Asymmetric key encryption

First, let’s look at asymmetric key encryption with a simple analogy.

Imagine you wanted to send something to your friend, but it was absolutely essential that nobody else, except your friend, could have access to that object. So, your friend buys an indestructible box, fabricated from the strongest metal on the planet, and sends it to you so that you can place the object in it. Your friend also sends you the key that can only be used to lock the box.

Now, this box has one more special property. It has two keyholes. One keyhole to open the box, another to lock the box.

Naturally, this box will also need two keys – one to open and another to lock it.

Both keys are similar, but not identical. As you can see in the image above, for example, the key used to open the box has two prongs while the key used to lock the box has three prongs.

As the sender of the object, all you have is the box to place the object in and a key to lock the box. Only your friend has the key that can unlock the box.

The key used to lock the box is called the public key, and cannot be used to open it, as that requires the private key. If anyone intercepted the package and made a copy of the public key, it could not be used to open the box, only to lock it. Only the person who holds the private key can open the box.

Asymmetric key encryption is used when there are two or more parties involved in the transfer of data. This type of encryption is used for encrypting data in transit, that is encrypting data being sent between two or more systems. The most popular example of asymmetric key encryption is RSA .

Symmetric key encryption

Symmetric key encryption uses the same key for encryption and decryption. This makes sharing the key difficult, as anyone who intercepts the message and sees the key can then decrypt your data.

This is why symmetric key encryption is generally used for encrypting data at rest. AES-256 is the most popular symmetric key encryption algorithm. It is used by AWS for encrypting data stored in hard disks (EBS volumes) and S3 buckets. GCP and Azure also use it for encrypting data at rest.

How TLS/SSL Uses Both Symmetric and Asymmetric Encryption

The main strength of symmetric key encryption is that it is computationally easier and faster to encrypt and decrypt data using a single key, just as it is easier to build a box with a single lock and key.

The weakness of symmetric key encryption is that if the key is exposed, your data is no longer securely encrypted. So, if you needed to share the key with an external party, there is a risk that the key could be exposed, leaving your data at risk of being decrypted.

Symmetric key encryption is ideal for encrypting data at rest, where you do not need to share the key with another system.

With asymmetric encryption, this is not a problem since two separate keys are used – the public key to encrypt data and the private key to decrypt data.

The public key can be easily shared with anyone and poses no risk to your data being decrypted, since the private key is needed for decryption.

The drawback of asymmetric key encryption is that the encryption and decryption process is slower and more complicated. Asymmetric key encryption is ideal for encrypting data in transit, where you need to share the key with another system.

What if there was a way of getting the speed and computational simplicity of symmetric encryption without increasing the risk of exposing your keys?

TLS/SSL encryption use both symmetric and asymmetric keys to encrypt data in transit, and is used with the HTTP protocol for secure communications over a computer network.

TLS/SSL Encryption Explained

TSL (Transport Layer Security) and SSL (Secure Sockets Layer) are often used interchangeably to mean the same thing. But when people say SSL, they often mean TLS.

TLS is generally considered more secure than SSL due to several improvements made to the protocol, such as stronger cryptographic algorithms. Due to security concerns with SSL, most modern web browsers and applications have dropped support for SSL and only support TLS. As a result, TLS has become the standard for secure communication over the internet.

How to Use Symmetric and Asymmetric Encryption at the Same Time

Let's say you want to securely send a parcel to your friend. But you don’t want to keep using the special indestructible box that has two keyholes and two locks. It is expensive, heavy and impractical to use for frequent communications. You still want to use an indestructible box, but one that is simpler, with a single lock and key.

However, if you are using a box with only a single lock and key, you now need to figure out how to securely share the key for that simpler box with your friend.

Since the same key is used to both open and lock it, you cant just send the key to your friend without somehow protecting it first. If the key is intercepted and a copy is taken by someone, they can now open your box and take what is inside.

How can you securely share this key with your friend so that you can use this simpler box for future communication?

• First, your friend sends the box with the two locks plus the public key used to lock it. But you don’t want to keep using this box. You will only use this box once – to transfer the key for another simpler box that you will use for future exchanges.
• You place the master key that will be used in future exchanges inside this box and lock it with the public key sent by your friend.
• You send the locked box which contains a copy of the master key inside back to your friend.
• Your friend uses his private key to open the box. Now you both have the master key and can be sure no one else has it since it was sent in a secure box
• All future items are then placed in this simpler box with a single lock and key which can be opened and locked using the master key you just sent to your friend.

TLS/SSL Encryption Sequence

The analogy in the previous section neatly maps to how TLS/SSL encryption actually works. But there are some prerequisite steps which I ignored in this analogy, like creating a TCP connection and the server sending its certificate (Steps 1 and 2 below).

Also, Step 6 is a simplification of the process. In reality, the master key is used to generate a further set of keys that the client and server will use to encrypt and decrypt messages and also to authenticate that the messages were indeed sent by the client and server.

To read more about the low level detail, I’d recommend Chapter 8 of " Computer Networking " by Kurose & Ross.

But, at a high level, the sequence is as follows:

• Client establishes TCP connection with the server
• Client verifies that the server is who it says it is – server sends certificate which has the public key. The accompanying private key remains with the server.
• Client creates a master secret key and uses the server's public key to encrypt it. This master secret key is a symmetric key so the same key is used for encryption and decryption.
• Client sends the encrypted master secret key to the server.
• Server decrypts the encrypted master key using its private key.
• All future messages between client and server now use the symmetric master key to encrypt and decrypt messages.

Best of Both Worlds

Using both symmetric and asymmetric key encryption gives you the speed of symmetric key encryption without compromising on the extra security provided by asymmetric key encryption.

But nothing comes for free, of course. With TLS, there is an added layer of complexity since you need to first use asymmetric keys to establish a secure connection before exchanging the symmetric key for future communication.

So by using both symmetric and asymmetric encryption, TLS/SSL gets the best of both worlds with limited downsides.

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What Is Encryption?

Learn about the types of encryption, along with the benefits and challenges.

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Encryption Definition

Encryption is a form of data security in which information is converted to ciphertext. Only authorized people who have the key can decipher the code and access the original plaintext information.

In even simpler terms, encryption is a way to render data unreadable to an unauthorized party. This serves to thwart cybercriminals, who may have used quite sophisticated means to gain access to a corporate network—only to find out that the data is unreadable and therefore useless. 

Encryption not only ensures the confidentiality of data or messages but it also provides authentication and integrity, proving that the underlying data or messages have not been altered in any way from their original state.

How Encryption Works

Original information, or plain text, might be something as simple as "Hello, world!" As cipher text, this might appear as something confusing like 7*#0+gvU2x—something seemingly random or unrelated to the original plaintext.

Encryption, however, is a logical process, whereby the party receiving the encrypted data—but also in possession of the key—can simply decrypt the data and turn it back into plaintext.

For decades, attackers have tried by brute force—essentially, by trying over and over again—to figure out such keys. Cybercriminals increasingly have access to stronger computing power such that sometimes, when vulnerabilities exist, they are able to gain access.

Data needs to be encrypted when it is in two different states: "at rest," when it is stored, such as in a database; or "in transit," while it is being accessed or transmitted between parties.

An encryption algorithm is a mathematical formula used to transform plaintext (data) into ciphertext. An algorithm will use the key to alter the data in a predictable way. Even though the encrypted data appears to be random, it can actually be turned back into plaintext by using the key again. Some commonly used encryption algorithms include Blowfish, Advanced Encryption Standard (AES), Rivest Cipher 4 (RC4), RC5, RC6, Data Encryption Standard (DES), and Twofish.

Encryption has evolved over time, from a protocol that was used only by governments for top-secret operations to an everyday must-have for organizations to ensure the security and privacy of their data.

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Types of Encryption

There are many different types of encryption, each with its own benefit and use case.

Symmetric encryption

In this simple encryption method, only one secret key is used to both cipher and decipher information. While the oldest and best-known encryption technique, the main drawback is that both parties need to have the key used to encrypt the data before they can decrypt it. Symmetric encryption algorithms include AES-128, AES-192, and AES-256. Because it is less complex and executes faster, symmetric encryption is the preferred method for transmitting data in bulk.

Asymmetric encryption

Also known as public key cryptography , asymmetric encryption is a relatively new method that uses two different but related keys to encrypt and decrypt data. One key is secret and one key is public. The public key is used to encrypt data, and the private key is used to decrypt (and vice versa). Security of the public key is not needed because it is publicly available and can be shared over the internet. 

Asymmetric encryption presents a much stronger option for ensuring the security of information transmitted over the internet. Websites are secured using Secure Socket Layer (SSL) or Transport Layer Security (TLS) certificates. A query to a web server sends back a copy of the digital certificate, and a public key can be extracted from that certificate, while the private key stays private.

Data Encryption Standard (DES)

DES is a deprecated symmetric key method of data encryption. DES works by using the same key to encrypt and decrypt a message, so both the sender and the receiver must have access to the same private key. DES has been superseded by the more secure AES algorithm. It was adopted by the U.S. government as an official standard in 1977 for the encryption of government computer data. It can be said that DES was the impetus for the modern cryptography and encryption industry.

Triple Data Encryption Standard (3DES)

The Triple Data Encryption Standard involved running the DES algorithm three times, with three separate keys. 3DES was largely seen as a stopgap measure, as the single DES algorithm was increasingly becoming seen as too weak to stand up to brute force attacks and the stronger AES was still under evaluation.

Rivest-Shamir-Adleman (RSA) is an algorithm and the basis of a cryptosystem—a suite of cryptographic algorithms used for specific security services or purposes. This enables public key encryption and is often used by browsers to connect to websites and by virtual private networks (VPNs). RSA is asymmetric, in which two different keys are used for encryption: one public and one private. If decryption is carried out with the public key, encryption is performed with the private key, or vice versa.

Advanced Encryption Standard (AES)

Developed in 1997 by the National Institute of Standards and Technology (NIST) as an alternative to the Data Encryption Standard, the Advanced Encryption Standard is a cipher chosen by the U.S. government to protect sensitive information. AES has three different key lengths to encrypt and decrypt a block of messages: 128-bit, 192-bit, and 256-bit. AES is widely used for protecting data at rest in such applications as databases and hard drives.

Encryption in the cloud

Cloud encryption is a service offered by cloud storage providers in which data is first encrypted using algorithms before being pushed to a storage cloud. Customers of a cloud storage provider must be aware of and comfortable with the level of depth of the provider's policies and procedures for encryption and encryption key management. 

Because encryption consumes more bandwidth, many cloud providers only offer basic encryption on a few database fields, such as passwords and account numbers. This is often not enough for some organizations. So they rely on a Bring Your Own Encryption (BYOE) model in which they use their own encryption software and manage their own encryption keys to ensure a level of cloud computing security they are comfortable with. 

As an opposite approach, Encryption as a Service  (EaaS) has emerged as a simple, pay-as-you-go service customers can purchase from a cloud provider, managing encryption themselves in a multi-tenant environment.

End-to-End encryption

End-to-end encryption (E2EE) ensures that only the two users communicating with one another can read the messages. Even the intermediary, such as the telecom or internet service provider, cannot decrypt the messages. E2EE is generally seen as the most secure way to communicate privately and securely online. Examples of E2EE in use include the  WhatsApp messaging service , which famously asserts that users' messages are secured with "locks."

The Benefits of Encryption

Privacy and security.

Encryption can prevent data breaches. Even if an attacker maliciously gains access to a network, if a device is encrypted, the device will still be secure, rendering attempts by the attacker to consume the data useless. Encryption ensures no one can read communications or data except the intended recipient or data owner. This prevents attackers from intercepting and accessing sensitive data.

Regulations

Encrypting data allows organizations to protect data and maintain privacy in accordance with industry regulations and government policy. Many industries, especially those in financial services and healthcare, have explicit rules on data protection. For example, the  Gramm-Leach-Bliley Act  requires financial institutions to let customers know how their data is being shared and also how their data is remaining protected. Encryption helps financial institutions comply with this act.

Secure internet browsing

Encryption also keeps users safe while browsing the internet. Earlier in the internet's history, attackers found ways to steal unencrypted information sent between users and web services over the Hypertext Transfer Protocol (HTTP). The standard to encrypt web content by running HTTP over the Secure Socket Layer protocol emerged, soon to be replaced with the Transport Layer Security protocol, enabling enterprises, publishers, and e-commerce providers to offer a secure experience for users. 

With encryption, users feel safer entering personal information into webpages and carrying out financial or e-commerce transactions.

Encryption keeps sensitive data safe

Encryption will continue to be a core security feature in everything from video chats to e-commerce to social media. Basically, if it can be shared or stored, it will be encrypted. Both organizations and individual users would benefit from keeping on top of encryption standards to ensure that both their personal and professional data is safe from misuse or compromise. 

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Encryption Challenges

Attackers will still attack even when they know that data or devices are encrypted. They figure that with some effort, they might get through. For many years, weak passwords served as the impetus for attackers to keep trying, as some sophisticated software could sooner or later figure out passwords.

Such brute force attacks have become more sophisticated, as attackers hope that by making thousands or even millions of guesses, they will figure out the key for decryption. However, most modern encryption methods, coupled with multi-factor authentication (MFA), are helping organizations to become more resistant to brute force attacks.

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How to Apply Security in PowerPoint Presentations

Prevent your presentations from being viewed or changed by others

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In This Article

Jump to a Section

Why Add Security

• Encrypt Your Presentations
• Save as Graphic Images
• Save as PDF
• Mark as Final Feature

What to Know

• Use the encryption feature in PowerPoint. Assign a password by going to Protect Presentation .
• Save the presentation as graphic images or a PDF file to keep the information visible but not easily editable.
• Use the Mark as Final feature to ensure that no further edits are made inadvertently.

This article explains several ways you can apply security in PowerPoint presentations. This information applies to PowerPoint 2019, 2016, 2013, 2010 and PowerPoint for Microsoft 365.

Security in PowerPoint is a concern when your presentation contains sensitive or confidential information or when you don't want anyone making changes to the presentation. Below are some of the methods used to secure presentations to avoid tampering with information or theft of your ideas.

Encrypt Your PowerPoint Presentations

Using the encryption feature in PowerPoint is a way to keep others from accessing your presentation. A password is assigned by you in the creation process of the presentation . The viewer must enter this password in order to open or modify your work.

Secure PowerPoint Slides by Saving as Graphic Images

Saving your completed slides as graphic images ensures that the information remains intact. This method takes a little more work, as you have to first create your slides, save them as pictures, and then reinsert them into new slides.

This method is one you would use if it is imperative that the content remains unchanged, as in the case of confidential financial data being presented to board members.

Save PowerPoint Presentations as a PDF File

Secure your PowerPoint presentation from any edits by saving, or publishing, it in PDF format . This retains all the formatting you applied, even when the viewing computer doesn't have those particular fonts, styles, or themes installed. This is a great option when you need to submit your work for review, but don't want the reader to make any changes.

Mark as Final Feature in PowerPoint

Once your presentation is complete and ready for prime time, use the Mark as Final feature to ensure that no further edits are made inadvertently.

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Microsoft 365 Life Hacks > Presentations > How to password protect your PowerPoint presentations

How to password protect your PowerPoint presentations

Learn how to password protect a PowerPoint presentation and get additional tips for keeping your online files safe even as you share them with your colleagues and contributors.

As the most versatile and widely used presentation software, Microsoft PowerPoint presentations often contain valuable content that requires protection. From company earnings results to trade secrets, students’ projects, or the questions and answers to a quiz, it’s essential for PowerPoint users to safeguard their sensitive data and confidential information, so that they won’t be easily accessed by hackers or unauthorized parties in general.

Why should you add password protection to your PowerPoint files?

A password is the easiest way to add a layer of protection to any of your files, and it’s an effective deterrent to ward off those who aren’t supposed to access them. If you’re sharing sensitive information at your work, or delivering a confidential presentation, a password will reduce the chance of a data breach or the misuse of your presentation’s contents.

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There are many ways in which your files can fall into the wrong hands: whether you store them on a removable USB drive, which can be easily lost, or email an unencrypted file to a compromised account, adding a password adds an extra layer of security. If you’re sharing a PowerPoint presentation online with multiple collaborators, consider using secure cloud storage like Microsoft OneDrive .

By taking a few minutes to implement password protection, you gain peace of mind knowing that your data is safeguarded. Be sure to share your file access with only the people who are authorized to see it.

How to add a password to your PowerPoint presentation

Adding a password to protect your PowerPoint file is easy! Follow these steps to password protect your presentation :

• Open your PowerPoint presentation and select File , then Info .
• Select Protect Presentation . Here, you have multiple options on who can access, view, or edit your presentation.
• Always Open Read-Only prevents viewers from accidentally making changes. Restrict Access allows you to select who can read, copy, or edit. Add a Digital Signature secures your file with proof that someone has opened it. Mark as Final lets your viewers know that they’re looking at the final draft of your presentation.
• To add a password, select Encrypt with Password , the second option in the drop-down menu.
• A dialog box will open. Enter your password and select OK .

Be sure to remember what your password is, as PowerPoint’s powerful encryption abilities will lock you out if you’re not able to remember your own password. You can use any word or combination of letters and numbers to secure your file and remember that all passwords are case-sensitive. When sharing your password-protected PowerPoint files via email, use encrypted emailing ( which Outlook offers ) for an added layer of security.

Taking a few moments to easily add this security layer can save you from unauthorized access and the potentially damaging impact of a data breach. Whether it’s a presentation in a corporate environment, an academic project, or some personal content, adding password protection ensures that your files will remain confidential and secure.

But don’t just stop there: PowerPoint’s advanced presentation features are effective for all subjects and audiences! If you’re looking to get the most out of conveying information, read these additional tips and tricks on how to ace your upcoming presentation , whether you’re looking to dazzle your audience , improving your public speaking skills , or you’re curious about the 30+year history of PowerPoint .

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Password protection for presentations in PowerPoint

A password helps to prevent other people from opening or modifying a presentation.

Caution:  When you create a password for a presentation, record the password and keep it in a secure place. If you lose the password, it can't be retrieved and you won't be able open or gain access to the presentation.

Add password protection to a file

Select File > Info .

Select Protect Presentation > Encrypt with Password .

In the Password box, enter the password you'd like to use. Select OK .

PowerPoint prompts you to confirm the password by entering it once more.

Save the file to ensure the password takes effect.

Password protection isn't supported in PowerPoint for ODP (Open Document Presentation) files. 

Remove a password from a file

Removing a password from a document is a simple process, but you have to know the original password.

Open the presentation whose password you want to remove.

Clear the password in the Password box, and then click OK .

Co-authoring a password-protected file

If you attempt to open a password-protected file that someone else is currently working on, you'll be able to open it, but you won't be able to edit it. You'll see the file in read-only mode.

Add or remove protection in your document, workbook, or presentation

Require a password to open a presentation

Click File > Passwords .

Under Password to open , select the Encrypt this presentation and require a password to open check box.

In the New password box, type a password.

Note:  To create a strong password, use at least seven characters and include a combination of uppercase and lowercase letters, numbers, and non-alphabetic characters such as !,$, #, and %. Do not include your account name or other personal information.

In the Verify box, type the password again, and then click Set Password .

Click OK , and then save your presentation.

Tip:  To remove the password, clear the Encrypt this presentation and require a password to open check box, click OK , and then save your presentation.

Require a password to modify a presentation

You can add a password so that only authorized users can modify a presentation. Unauthorized users can still open the presentation and then save it by using a different file name.

Under Password to modify , select the Require a password to modify the presentation check box.

Tip:  To remove the password, clear the Require a password to modify the presentation check box, click OK , and then save your presentation.

Change a password to open or modify a presentation

Under Password to open or Password to modify , click Change Password .

In the New password box, type the new password.

To open a password-protected presentation: Enter the password for the file in the box.

Passwords are case-sensitive. Make sure you don't accidentally have Caps Lock turned on.

You can try again if you enter an incorrect password.

The file can't be opened without the password. If you don't know the password, you'll have to check with the person that encrypted the file. 

For ODP (Open Document Presentation) files, password protection isn't supported in PowerPoint for the web.

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Cryptography Thesis

Cryptography thesis presentation, free google slides theme and powerpoint template.

Once again, Slidesgo reminds you that we live in the era of information and technology. This means we move lots of data every day... but we must ensure that the data is secure! Our templates are, just like this one for thesis defenses. If you've finished a study on cryptography, use this colorful design and its translucent shapes! Explain the methodology, the analysis of the results, the conclusions, the bibliographical references and other main points from your dissertation. It's the "safest" way to an A+!

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• 25 different slides to impress your audience
• Contains easy-to-edit graphics such as graphs, maps, tables, timelines and mockups
• Includes 500+ icons and Flaticon’s extension for customizing your slides
• Designed to be used in Google Slides and Microsoft PowerPoint
• 16:9 widescreen format suitable for all types of screens
• Includes information about fonts, colors, and credits of the resources used

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Attribution required If you are a free user, you must attribute Slidesgo by keeping the slide where the credits appear. How to attribute?

Related posts on our blog.

How to Add, Duplicate, Move, Delete or Hide Slides in Google Slides

How to Change Layouts in PowerPoint

How to Change the Slide Size in Google Slides

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19 Best Encryption-Themed Templates for PowerPoint & Google Slides

With over 6 million presentation templates available for you to choose from, crystalgraphics is the award-winning provider of the world’s largest collection of templates for powerpoint and google slides. so, take your time and look around. you’ll like what you see whether you want 1 great template or an ongoing subscription, we've got affordable purchasing options and 24/7 download access to fit your needs. thanks to our unbeatable combination of quality, selection and unique customization options, crystalgraphics is the company you can count on for your presentation enhancement needs. just ask any of our thousands of satisfied customers from virtually every leading company around the world. they love our products. we think you will, too" id="category_description">crystalgraphics creates templates designed to make even average presentations look incredible. below you’ll see thumbnail sized previews of the title slides of a few of our 19 best encryption templates for powerpoint and google slides. the text you’ll see in in those slides is just example text. the encryption-related image or video you’ll see in the background of each title slide is designed to help you set the stage for your encryption-related topics and it is included with that template. in addition to the title slides, each of our templates comes with 17 additional slide layouts that you can use to create an unlimited number of presentation slides with your own added text and images. and every template is available in both widescreen and standard formats. with over 6 million presentation templates available for you to choose from, crystalgraphics is the award-winning provider of the world’s largest collection of templates for powerpoint and google slides. so, take your time and look around. you’ll like what you see whether you want 1 great template or an ongoing subscription, we've got affordable purchasing options and 24/7 download access to fit your needs. thanks to our unbeatable combination of quality, selection and unique customization options, crystalgraphics is the company you can count on for your presentation enhancement needs. just ask any of our thousands of satisfied customers from virtually every leading company around the world. they love our products. we think you will, too.

Widescreen (16:9) Presentation Templates. Change size...

PPT layouts having computer hacker silhouette of hooded man reaching and stealing network password to steal confidential data concept for security encryption crime and virus protection

Presentation design having composite of programming language and padlock over network server room circuit board security protection data storage password encryption and technology concept

Presentation theme featuring composite of multiple words programming language and padlock over network server room circuit board security protection data storage password encryption and technology concept

Slide deck with encryption concept - red decrypted letters in middle of digital code

Presentation theme having cyber safety or security encryption concept code numbers pad lock on laptop computer

Slide deck having ssl secure sockets layer for security and encryption random alphabets with letters in background

Slides with correct key security and encryption concept image

Slides enhanced with code numbers pad lock on hard disk security encryption concept

PPT theme having security and encryption random alphabets with letters of authentication on top

Slide deck featuring security and encryption random alphabets with letters of security on top

PPT layouts enhanced with encryption and other random alphabets

Slides with encryption - computer network security concept - isolated text in vintage wood letterpress printing blocks stained by color inks

Slide set with many keys in the dark security and encryption concept image

Slide set consisting of encryption concept - red laser decrypting letters in middle of digital code

Theme with computer keyboard background

Slides featuring malware security and encryption random alphabets in background

PPT layouts with image of an external hard drive with the text hardware encryption

Slide set consisting of phishing security and encryption random alphabets in background

More encryption presentation templates.

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Security in Presentation

19 Sep 2023 11 minutes to read

Encrypting with password

You can protect a PowerPoint Presentation by encrypting the document by using a password. This prevents unauthorized users to access or make changes in the Presentation.

The following code example demonstrates how to encrypt a PowerPoint Presentation with password.

• C# [Cross-platform]
• C# [Windows-specific]
• VB.NET [Windows-specific]

You can download a complete working sample from GitHub .

Decrypting the PowerPoint Presentation

Essential Presentation provides ability to remove the encryption from the PowerPoint Presentation. You can decrypt a PowerPoint Presentation by opening it with the password.

Opening the Encrypted PowerPoint Presentation

The following code example demonstrates opening the encrypted PowerPoint Presentation.

Removing the encryption from Presentation

The following code example demonstrates removing the encryption from a PowerPoint Presentation.

Write Protection

You can set write protection for a PowerPoint Presentation and remove protection from the write protected PowerPoint presentation.

Protect PowerPoint Presentation

You can protect a PowerPoint Presentation with password to restrict unauthorized editing.

The following code example shows how to set write protection for a PowerPoint Presentation.

Remove Protection

You can check whether a PowerPoint Presentation is write protected and remove protection from the write protected PowerPoint Presentation.

The following code example shows how to remove restriction protection from the write protected PowerPoint Presentation

NOTE In Xamarin applications, Encryption, Decryption and Write Protection features are supported from the target framework .NET Standard 2.0 version onwards. For ASP.NET Core, Encryption, Decryption and Write Protection features are supported from the .NET Core 2.0 version onwards.

  Layer 6 Presentation Layer

De/Encryption, Encoding, String representation

The presentation layer (data presentation layer, data provision level) sets the system-dependent representation of the data (for example, ASCII, EBCDIC) into an independent form, enabling the syntactically correct data exchange between different systems. Also, functions such as data compression and encryption are guaranteed that data to be sent by the application layer of a system that can be read by the application layer of another system to the layer 6. The presentation layer. If necessary, the presentation layer acts as a translator between different data formats, by making an understandable for both systems data format, the ASN.1 (Abstract Syntax Notation One) used.

OSI Layer 6 - Presentation Layer

The presentation layer is responsible for the delivery and formatting of information to the application layer for further processing or display. It relieves the application layer of concern regarding syntactical differences in data representation within the end-user systems. An example of a presentation service would be the conversion of an EBCDIC-coded text computer file to an ASCII-coded file. The presentation layer is the lowest layer at which application programmers consider data structure and presentation, instead of simply sending data in the form of datagrams or packets between hosts. This layer deals with issues of string representation - whether they use the Pascal method (an integer length field followed by the specified amount of bytes) or the C/C++ method (null-terminated strings, e.g. "thisisastring\0"). The idea is that the application layer should be able to point at the data to be moved, and the presentation layer will deal with the rest. Serialization of complex data structures into flat byte-strings (using mechanisms such as TLV or XML) can be thought of as the key functionality of the presentation layer. Encryption is typically done at this level too, although it can be done on the application, session, transport, or network layers, each having its own advantages and disadvantages. Decryption is also handled at the presentation layer. For example, when logging on to bank account sites the presentation layer will decrypt the data as it is received.[1] Another example is representing structure, which is normally standardized at this level, often by using XML. As well as simple pieces of data, like strings, more complicated things are standardized in this layer. Two common examples are 'objects' in object-oriented programming, and the exact way that streaming video is transmitted. In many widely used applications and protocols, no distinction is made between the presentation and application layers. For example, HyperText Transfer Protocol (HTTP), generally regarded as an application-layer protocol, has presentation-layer aspects such as the ability to identify character encoding for proper conversion, which is then done in the application layer. Within the service layering semantics of the OSI network architecture, the presentation layer responds to service requests from the application layer and issues service requests to the session layer. In the OSI model: the presentation layer ensures the information that the application layer of one system sends out is readable by the application layer of another system. For example, a PC program communicates with another computer, one using extended binary coded decimal interchange code (EBCDIC) and the other using ASCII to represent the same characters. If necessary, the presentation layer might be able to translate between multiple data formats by using a common format. Wikipedia

• Data conversion
• Character code translation
• Compression
• Encryption and Decryption

The Presentation OSI Layer is usually composed of 2 sublayers that are:

CASE common application service element

Sase specific application service element, layer 7   application layer, layer 6   presentation layer, layer 5   session layer, layer 4   transport layer, layer 3   network layer, layer 2   data link layer, layer 1   physical layer.

ETSI Security Conference 2024

Call for presentations, programme committee, venue & travel.

ETSI’s annual flagship event on Cyber Security, the ETSI Security Conference,  will take place face-to-face from  14 to 17 October 2024,  in ETSI, Sophia Antipolis, France .   Save the date in your calendar not to miss this opportunity to Meet and Network with the Community! 

This exclusive face-to-face event will provide an exceptional opportunity for the security community to come together to exchange with experts, network with peers, and share facts and opinions around the most relevant subjects of cybersecurity standardization. The intensive 4-day programme will gather speakers from government agencies, other standards bodies, academia and various industry sectors. 

This year's event will address AI - Impacts of Regulation on Zero Trust and Consumer devices - Societal Impact of Technology-  Fraud, Security and Standards Convergence - 5G to 6G - Privacy and Considerations of Employing Encryption Technologies -Transport, Public safety and Critical Communications - Consumer verticals. 

You may want to give a talk or present a poster during the ETSI Security Conference! Currently the Programme Committee is calling for Presentations/ Posters: d o not miss the deadline: 26 May!   Please check here the submission modalities and submit your proposal . 

The event stable programme and the registration opening will be announced in the course of July. Subscribe to this mailing list  to be kept informed of its launch. 

Venue: ETSI Headquarters 650 Route des Lucioles 06560 Valbonne - Sophia Antipolis

FRANCE Tel: +33 4 92 94 42 00 

The Programme Committee is now calling for Presentations / Posters.   Should you want to send a presentation or poster proposal, please SUBMIT YOUR PROPOSAL  by 26 May ..

Note : Due to the high number of presentation proposals expected, we recommend to strictly submit your proposal within the announced deadline, as no extension will be granted.  Marketing / commercial speeches are not welcome. 

Proposal status will be provided by the end of June, as it is intended to publish a stable event programme in the course of July.

The presentations proposed should fit within the following sessions objectives: 

• Impacts of Regulation - Capturing European values in Technologies : The session will focus on impacts of regulation on products, innovation and technology. It will consider how EU regulation (e.g. AI Act, e-IDAS, RED, CRA, NIS2) and other regional regulations have shaped the global technology landscape. The session will also consider points of friction and gaps between aims of regulation and actual security improvements for products placed on the market.
• AI as a Technology / Platform : The session will consider AI security from the perspective of securing AI as a generic platform capability. The session will discuss latest challenges, threats, legislation and approaches to providing secure AI.
• AI "Verticals" / End Applications : The session will consider AI security from the perspective of securing AI as deployed in specific vertical applications. The session will discuss latest challenges, threats, legislation and approaches to implementing AI in specific vertical / end applications.
• Societal Impacts of Technology : This session will explore the societal impact of technology on end users and society. Topics including coercive control avoidance, Metaverse, protection of children, disinformation and protection vulnerable citizens will be discussed.
• Impact of Regulation - Zero Trust :  The session will explore latest developments, regulatory landscape and best practice for zero trust.
• Impact of Regulation - Consumer Devices:  :The session will explore impacts of regulation on consumer products and devices. It will particularly explore successes, failures, best practice and gaps. Focus areas to include IoT and automotive.
• Quantum Session:  The session explore latest developments in quantum algorithm selection, migration strategy, best practice, agility and other cryptography.
• Fraud, Security and Standards Convergence:  This session will explore where standards are being driven by fraud and where fraud is driving standards. The session will discuss how security and fraud prevention / detection can work more closely. Focus areas to include; 5G, PSD2, eSignature and e-payments.
• 5G to 6G Evolution or Revolution?  In early 2024 3GPP, ETSI and GSMA started the multi-year process of developing standards for 6G. While 6G won’t reach the market until ~2030, 2024 to 2026 with be the key years in which 6G architecture is standardised. This session will explore 6G challenges and opportunities from a security perspective.
• Privacy and Considerations of Employing Encryption Technologies:  Privacy by design has become a corner stone of all new information communication technology systems, devices and applications. However this and zero trust can also have negative consequences for security.  The session will explore the interplay between encryption technologies to support privacy requirements, versus the need to detect and mitigate threats, malware and other malicious attacks. This will include consideration for limiting the spread of disinformation.
• Transport, Public safety and Critical communications:  The session will explore security for Transport, Public Safety, Critical Industries and Critical Communications. Topics to include; Tetra replacement, FRMCS Rail, 3GPP SA6 work.
• Consumer Verticals:  The session will explore latest security best practice, challenges and gaps for consumer IoT and other smart devices.

The ETSI Security Conference 2024 programme will be built by the following people:

• Samim Ahmadi, EY
• Charles Brookson, ZEATA Security
• Alex Cadzow, C3L
• Scott Cadzow, C3L
• Matt Campagna, Amazon Web Services
• Peter C, NCSC
• Mirko Cano Soveri, ETSI/3GPP
• Slawomir Gorniak, ENISA
• Alan Hayward, NCSC
• Holie Hennessy, OMDIA
• Alex Leadbeater,GSMA, Programme Committee Chair
• Tieyan Li, Huawei
• Gerry McQuaid, Ofcom
• Mats Naslund, NDRE
• Kim  Nordstrom , ETSI
• Jean-Pierre Quémard, KAT
• Davide Pratone, Huawei
• Tony Rutkowski, CIS
• George Sharkov, European DIGITAL SME Alliance & SBS
• Nataliya Stanetsky, Google Ireland Limited
• Colin Whorlow, NCSC
• Alf Zugenmaier, NTT Docomo

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