Overview

1. How To Crack Irdeto 2 Encryption Codes 2016
2. How To Crack Irdeto 2 Encryption Codes Pc
3. Irdeto 2 Encryption Codes

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In this lesson, students are introduced to the need for encryption and simple techniques for breaking (or cracking) secret messages. Students try their own hand at cracking a message encoded with the classic Caesar cipher and also a Random Substitution Cipher. Students should become well-acquainted with idea that in an age of powerful computational tools, techniques of encryption will need to be more sophisticated. The most important aspect of this lesson is to understand how and why encryption plays a role in all of our lives every day on the Internet, and that making good encryption is not trivial. Students will get their feet wet with understanding the considerations that must go into making strong encryption in the face of powerful computational tools that can be used to crack it. The need for secrecy when sending bits over the Internet is important for anyone using the Internet.

Purpose

“Encryption” is a process for transforming a message so that the original is “hidden” from anyone who is not the intended recipient. Encryption is not just for the military and spies anymore. We use encryption everyday on the Internet, primarily to conduct commercial transactions, and without it our economy might grind to a halt.

This lesson gives students a first taste of the kind of thinking that goes into encrypting messages in the face of computational tools. Computational tools dramatically increase the strength and complexity of the algorithms we use to encrypt information, but these same tools also increase our ability to crack an encryption. Developing strong encryption relies on knowledge of problems that are “hard” for computers to solve, and using that knowledge to encrypt messages. As a resource, you may wish to read all of Chapter 5 of Blown to Bits. It provides social context which you may want to bring to your classroom.

Agenda

Objectives

Students will be able to:

• Explain why encryption is an important need for everyday life on the Internet.
• Crack a message encrypted with a Caesar cipher using a Caesar Cipher Widget
• Crack a message encrypted with random substitution using Frequency Analysis
• Explain the weaknesses and security flaws of substitution ciphers

Preparation

Links

For the Students

• Encryption and Public Keys - Video (download)

Vocabulary

• Caesar Cipher - a technique for encryption that shifts the alphabet by some number of characters
• Cipher - the generic term for a technique (or algorithm) that performs encryption
• Cracking encryption - When you attempt to decode a secret message without knowing all the specifics of the cipher, you are trying to 'crack' the encryption.
• Decryption - a process that reverses encryption, taking a secret message and reproducing the original plain text
• Encryption - a process of encoding messages to keep them secret, so only 'authorized' parties can read it.
• Random Substitution Cipher - an encryption technique that maps each letter of the alphabet to a randomly chosen other letters of the alphabet.

Support

Getting Started (15)

Content Corner

If necessary provide context of some facts about the Internet:

• The Internet is not inherently secure.
• Packets traveling across the Internet move through many routers, each of which could be owned by different people or organizations.
• So we should assume all information traveling across the Internet to be public, as if written on a postcard and sent through the mail.

Remarks

Secrecy is a critical part of our lives, in ways big and small. As our lives increasingly are conducted on the Internet, we want to be sure we can maintain the privacy of our information and control who has access to privileged information.

Digital commerce, business, government operations, and even social networks all rely on our ability to keep information from falling into the wrong hands.

Classic Encryption - The Caesar Cipher

Background:

Many of the ideas we use to keep secrets in the digital age are far older than the Internet. The process of encoding a plain text message in some secret way is called Encryption

For example in Roman times Julius Caesar is reported to have encrypted messages to his soldiers and generals by using a simple alphabetic shift - every character was encrypted by substituting it with a character that was some fixed number of letters away in the alphabet.

As a result an alphabetic shift is often referred to as the Caesar Cipher.

Prompt:

• This message was encrypted using a Caesar Cipher (an “alphabetic shift”).
• Let’s see how long it takes you to decode this message (remember it’s just a shifting of the alphabet):

Teaching Tip

Resist the urge to give students a tool or device to aid in cracking this message – that’s coming in the next part of the lesson! Part of the point here is that it’s possible without tools. With tools it becomes trivial, as we’ll see next.

If students are struggling to start here are a few strategy suggestions:

• Find a small word and try alphabetic shifts until it’s clear that it’s an English word
• Remember the letters aren’t randomly substituted - the alphabet is just shifted.
• Once you have found the amount of shift the rest comes easily.

Display or write this on the board

• Give students about 3-5 minutes to work on cracking the message.
  • ANSWER: “free pizza in the cafeteria” - the A-Z alphabet is shifted 13 characters.

Recap:

• With this simple encryption technique it only took a few minutes to decode a small message.
• What if the message were longer BUT you had a computational tool to help you?!

Activity (35)

Content Corner

If you’d like your students to read a little bit about Historical Cryptography and cracking ciphers, check out ‘Substitution Ciphers and Frequency Analaysis’ in Blown to Bits, Chapter 5 - Reading pp. 165-169.

Cracking Substitution Ciphers

In this set of activities students will use two different versions of a simple widget in Code Studio to “crack” a messages encoded with substitution ciphers, including an alphabetic shift and random substitution.

Transition to Code Studio: Encryption Widgets on Code Studio

Part 1 - Crack a Caesar Cipher

Teaching Tip

Don’t rush it, but don’t linger on cracking caesar ciphers. Presenting and cracking a caesar cipher should go pretty fast.

The widget is pretty self-explanatory. Let students figure out how to use it on their own.

The goal here is make points about cracking encryption with computational tools, and start to use some common terms.

You should move on to cracking random substitution relatively quickly.

The instructions for this activity are simple - there is no handout:

• Put students in pairs/partners

Goal: Select a message encrypted with a caesar cipher and use the provided widget to “crack” it.

• Experiment with the tool - Click things, poke around, figure out what it’s doing.
• Choose one of the messages from the pull down menu and try to crack it using the tool.
• If you want to, enter you own message, encrypt it, and have a friend decrypt it.

Give students about 5 minutes to get into the tool and crack a few messages

• Aided with the tool, cracking an alphabetic shift is trivial.
• Once you’ve done one, it only takes a matter of seconds to do others.

Optional - Pause and Recap:

There is a page in Code studio which recaps terminology (encryption, decryption, crack, cipher, Caesar ciper) and poses the next problem.

You may optionally pause here to recap and go over terms if you like or just let students proceed (see activity part 2 below).

Part 2 - Crack a Random Substitution Cipher

After re-capping the first activity make sure students understand the following before proceeding:

• Cracking a Caesar cipher is easy…trivial with a computational tool like the one we used.
• The next step is to make the encryption slightly harder…

New Challenge:

• What if instead of shifting the whole alphabet, we mapped every letter of the alphabet to a random different letter of the alphabet? This is called a random substitution cipher.

• The new version of the widget you’ll see is a more sophisticated version of the encryption tool that shows you lots of different stuff.

• But what it does is bit of a mystery! Let’s check it out…

Get Cracking

Use a Discovery-based approach

REMINDER: Discovery-based introduction of tools in a nutshell:

• Get students into to the tool without much or any introduction
• Give students working in partners a fixed amount of time (5 minutes or so) to poke around and see if they can figure out what it does and doesn’t do – typically this might be presented as a mystery worth investigating
• Ask the group to report what they found
• Teacher fill in any gaps or explanations of how the tool works afterwards

This widget, like all others, are meant as a learning tool. You cannot break it so you are encouraged to let students play and investigate to figure out how the tools work.

These discovery-based methods of introducing tools have been tested in professional development and have worked well for teachers who use this curriculum. This method is effective for a few reasons, but overall students find this approach more engaging and fun, and they tend to be more receptive to, and motivated to hear, explanations of how the tool works after trying to “solve the mystery” themselves.

• Have students click to the next bubble to see the frequency analysis version of the widget. (It should look like the screen shown below)

Goal: let students explore for 5-10 minutes to see if they can discover what the tool is showing them and allowing them to do.

The tasks laid out for students in code studio are:

• Figure out what is going on in this new version of the tool
• What information is being presented to you?
• Figure out what the the tool let’s you do
• As usual: you can’t break it. So click on things, poke around.
• If you figure it out you might be able to crack a message encoded with random substitution.

• After some exploration time regroup to clarify what the tool is and how it works.

• If necessary point out to students that the next level in code studio (the one after the frequency analysis tool) explains a little bit about how frequency analysis works and suggests a few strategies for how to get started.

Give students about 15-20 minutes to crack one of the messages.

• If they finish there are more to try.
• Students can enter their own messages, do a random substitution to encrypt it, then copy/paste the encrypted version and see if a friend can crack it.
• It is possible to get pretty proficient at cracking these messages with the tool.

Wrap-up (10)

Video: Encryption and Public Keys

Wrap up goals

The video re-iterates a number of points that came out in this lesson.

Understand the relationship between cryptographic keys and passwords.

• A Key is an input to an encryption algorithm. A password is basically the same thing.

Understand why using longer passwords makes them harder to guess.

• Longer passwords increase the number of possible keys making it Computationally hard to guess what the key is.

• Show the The Internet: Encryption & Public Keys - Video

You should know about this video:

• 0:00 to 4:11 covers Caesar and Vigenere ciphers and explains why they are hard to crack
• After 4:11…it explains the difference between encryption that uses symmetric v. asymmetric keys which is related to material on public key encryption and is intended as a preview/teaser for more modern encryption techniques.

Discussion

As part of wrap up the major points we want to draw out are:

• Encryption is essential for every day life and activity
• The “strength” of encryption is related to how easy it is to crack a message, assuming adversary knows the technique but not the exact “key”
• A random substitution cipher is very crackable by hand though it might take some time, trial and error.
• However, when aided with computational tools, a random substitution cipher can be cracked by a novice in a matter of minutes.
• Simple substitution ciphers give insight into encryption algorithms, but as we’ve seen fall way short when a potential adversary is aided with computational tools…our understanding must become more sophisticated.
• If we are to create a secure Internet, we will need to develop tools and protocols which can resist the enormous computational power of modern computers.

Here are a couple of thought-provoking prompts you can use to bring closure to the lesson and as an avenue to draw out the points above. Choose one or more.

Prompts:

How much easier is it to crack a caesar cipher than a random substitution cipher? Can you put a number on it?

• For Caesar’s Cipher there are only 25 possible ways to shift the alphabet. Worst case, you only need to try 25 different possibilites. A random substitution cipher has MANY more possibilities (26 factorial = 4x10 ²⁶ possibilities). However, as we learned, with frequency analysis we can avoid having to try all of them blindly.

Was it difficult to crack a Random Substitution cipher? Did it take longer than you thought? shorter? Why?

• Computational tools aid humans in the implementation of encryption, decryption, and cracking algorithms. In other words, using a computer changes the speed and complexity of the types of encryption we can do, but it also increases our ability to break or circumvent encryption.

Any encryption cipher is an algorithm for transforming plaintext into ciphertext. What about the other way around? Can you write out an algorithm for cracking a Ceasar cipher? What about a random substitution cipher?

• An algorithm for cracking a Caesar cipher is pretty easy - for each possible alphabetic shift, try it, see if the words come out as english.
• An algorithm for cracking random substitution is trickier and more nunanced. There might not be a single great answer but through thinking about it you realize how tricky it is to codify human intelligence and intuition for doing something like frequency analysis into a process that a machine can follow. It probably requires some human intervention which is an interesting point to make.

Review of Terminolgoy – you can use this opportunity to review new vocabulary introduced in the activity and respond to questions students may have encountered during the activity.

• Definitions of cryptography, encryption, decryption, cracking/breaking an encryption, cipher, etc.

Extended Learning

Teaching Tips

Students should be encouraged to chat with their partner while completing the worksheet. The questions are fairly straightforward and the point is more to use the questions as a guide to the reading, than to find all the answers as quickly as possible.

Read Blown to Bits

• Read pp. 165-169 of Blown to Bits, Chapter 5 - Reading.
• Answer the questions provided in the reading guide and worksheet Reading Guide for Encryption - Worksheet

More Blown to Bits

• The earlier sections of Chapter 5 of Blown to Bits make reference to the significance of and controversies surrounding encryption in the aftermath of September 11th. This reading may be a useful tool for further introducing the impact of cryptography on many aspects of modern life.

• Ask students to review the history of their Internet browsing and calculate roughly what percentage they conduct with the assumption that it is “private.” Do they have any way of being sure this is the case? Are there any websites they visit where they feel more confident in the secrecy of their traffic than others? Are they justified in this conclusion?

Standards Alignment

View full course alignment

CSTA K-12 Computer Science Standards

• CI.L3A:10 - Describe security and privacy issues that relate to computer networks.

• CL.L2:2 - Collaboratively design, develop, publish and present products (e.g., videos, podcasts, websites) using technology resources that demonstrate and communicate curriculum. concepts.

How To Crack Irdeto 2 Encryption Codes 2016

• CPP.L3A:9 - Explain the principles of security by examining encryption, cryptography, and authentication techniques.
• CPP.L3B:5 - Deploy principles of security by implementing encryption and authentication strategies.

• CT.L3B:4 - Evaluate algorithms by their efficiency, correctness, and clarity.

Computer Science Principles

• 1.2.2A - Computing tools and techniques can enhance the process of finding a solution to a problem.

• 3.3.1B - Security concerns engender tradeoffs in storing and transmitting information.
• 3.3.1F - Security and privacy concerns arise with data containing personal information.

• 6.3.1C - Implementing cybersecurity has software, hardware, and human components.
• 6.3.1H - Cryptography is essential to many models of cybersecurity.
• 6.3.1I - Cryptography has a mathematical foundation.
• 6.3.1K - Symmetric encryption is a method of encryption involving one key for encryption and decryption.

• 7.3.1G - Privacy and security concerns arise in the development and use of computational systems and artifacts.

Key concepts
Patterns
Code
Puzzles
Cryptography

Introduction
If you need to send a secret message to a friend, how could you prevent other people from reading it? One way is to encrypt the message—that is, use a secret code that only you and your friend know. Try this activity to learn how to create your own “Caesar cipher,” a popular type of code that is easy to learn.

Background
Cryptography is the study of writing or solving secret codes that are used for secure communication. Historically, codes have been used by politicians, spies and countries at war to prevent their enemies from knowing what they’re up to. Many of the earliest codes, or “ciphers,” such as the one you will create in this project were easy to create by hand. Now cryptography is essential in computer science for keeping everything from e-mails to bank account information secure.

The Caesar cipher, named after Roman Emperor Julius Caesar is one of the earliest and most widely known ciphers. It is a simple form of a “substitution cipher” where you replace each letter of the alphabet with another letter by shifting the whole alphabet a certain number of letters (wrapping around to the beginning once you reach the end). For example, this would be your key and code if you shift each letter by three spaces:

Plain: ABCDEFGHIJKLMNOPQRSTUVWXYZ
Cipher: XYZABCDEFGHIJKLMNOPQRSTUVW

So, when you write your message, the letter A gets replaced with X, B gets replaced with Y and so on. For example, the word “HELLO” reads:

Plain: HELLO
Cipher: EBIIL

In order to decode your message, you need to share the “key” (the number 3) with your friend. After that you can send messages that are written in cipher so other people can't read them!

Materials

• Pencil and paper
• At least one other person

How To Crack Irdeto 2 Encryption Codes Pc

Preparation

• Explain the concept of a Caesar cipher to a friend or have them read the background section of this activity.
• Write down the alphabet from A to Z.
• Pick a number from 1 to 25. (If you use 26, you will just wind up with the original alphabet.) This number is your key.

Procedure

• Shift the entire alphabet by the number you picked and write it down below your original alphabet (as shown above).
• Pick a message to write to your friend. It might be easiest to start out with a simple message (such as a single word or phrase) before you try longer sentences or paragraphs.
• Write down your encoded message using your shifted alphabet. If it helps, write down your plain text message first then encode it one letter at a time (such as the “hello” example above). Just make sure the piece of paper you give your friend only has the encoded message!
• Give your friend the encoded message and tell them the key. Why do you think you wouldn't want to write down the key?
• See if your friend can decrypt your message. If it helps for the first try, let them work backward using the original and shifted alphabets you wrote down. Using the example from the background, the letter x becomes a; y becomes b; and so on.
• Try switching and using a different key for the same messages. Do either look easier to crack?
• Extra: Try finding a third person who does not know what a Caesar cipher is. Can they crack your code if they “intercept” your message?
• Extra: What if the person who intercepts your message knows about Caesar ciphers? Does that make it easier to crack the code? Because there are only 25 possible keys, Caesar ciphers are very vulnerable to a “brute force” attack, where the decoder simply tries each possible combination of letters. This might take some patience if a human does it, but nowadays computers can unravel the code in a fraction of a second, so Caesar ciphers are not considered a secure method to encrypt electronic communications.
• Extra: Another way to crack the Caesar cipher is “frequency analysis,” which is based on the fact that in natural English speech and writing, certain letters appear much more frequently than others. For example, the letter E appears more often than any other one whereas Z appears the least often. (If you have ever played the board game Scrabble, you might notice that this determines how many points letters are worth!) So, for example, if you read an entire paragraph and notice that the letter D appears more often than any other, odds are that it used a Caesar cipher with a shift of 1 (making E a D in the code). This technique will be more accurate for longer blocks of text and very inaccurate for short words or phrases because there are plenty of words that do not contain E at all. Can you have a friend write an entire paragraph with a Caesar cipher and then try to crack it using frequency analysis?
• Extra: If you plan to use the Caesar cipher for regular communication, one risk is that eventually someone will discover your key. You can help prevent this by changing the key, for example using a new one every week. This is a similar concept to periodically changing your computer passwords.
• Extra: The Caesar cipher is just one type of substitution cipher. Look up some other types of substitution ciphers and try them out. Are they harder or easier to use and crack?

Observations and results
Once you and your friend both understand how to use a Caesar cipher it should be relatively easy to send encrypted communications to each other. This can be a fun way to pass secret messages back and forth between friends. As discussed above, however, although the Caesar cipher provides a great introduction to cryptography, in the computer age it is no longer a secure way to send encrypted communications electronically.

More to explore
Basics of Cryptography: Caesar Cipher, from Instructables
Cryptography, from Learn Cryptography
Password Hacker, from Scientific American
Science Activities for All Ages!, from Science Buddies

Irdeto 2 Encryption Codes

This activity brought to you in partnership with Science Buddies