Brit explains the Caesar cipher, the first popular substitution cipher, and shows how it was broken with "frequency analysis". Created by Brit Cruise.
The student or class will watch a video clip about spies and secret codes from the past. Next students will be able to use a Pigpen cipher to crack a secret message of their own. Teachers can edit the message to fit their needs and make adjustments as desired. This is one mini lesson out of a series of five.
The student or class will watch a video clip about how to decode a Vigenère Square Cipher.Next students will be able to use the cipher to crack a secret message of their own (teacher provided messages in a hat (not inlcuded)). One student chooses the word or phrase, the teacher puts the key (word) on the board, that same student will encrypt the message and send it to their partner. The partner with use the same key word to return the text to plain text revealing the message and send their guess back to their partner. Teachers can edit the message to fit their needs and make adjustments as desired. This is one mini lesson out of a series of five (part 2) and can be used alone, or with other lessons in the series. Vigenère Square Ciphefrom the past. Next students will be able to use a Pigpen cipher to crack a secret message of their own. Teachers can edit the message to fit their needs and make adjustments as desired. This is one mini lesson out of a series of five. Vigenère Square Ciphe
The student will watch a brief video about the first Morse Code ever sent and how it impacted American communications, even today. Students will be able to decipher a short Morse Code code (SOS). They will also learn about Kryptos, an artwork that contains four secretive messages and is placed on display outside of the CIA headquarters.
The student or class will read about book ciphers and how they work. Students will then be able to use a cipher provided to crack a secret message. Teachers can edit the message to fit their needs and make adjustments as desired. This is one mini lesson out of a series of five, this is lesson four and it can be completed alone, or with any of the other lessons.
The student or class will watch a video clip about ciphers, specifically Caesar Ciphers. Next students will learn more about encryption and decryption through the use of "keys". Lastly, students will be introduced to the career path choices as a Cyber-security analyst. This is one lesson out of a series of five, and can be used alone, or with the some or all of the other four lessons.
This course introduces cryptography by addressing topics such as ciphers that were used before World War II, block cipher algorithms, the advanced encryption standard for a symmetric-key encryption adopted by the U.S. government, MD5 and SHA-1 hash functions, and the message authentication code. The course will focus on public key cryptography (as exemplified by the RSA algorithm), elliptic curves, the Diffie-Hellman key exchange, and the elliptic curve discrete logarithm problem. The course concludes with key exchange methods, study signature schemes, and discussion of public key infrastructure. Note: It is strongly recommended that you complete an abstract algebra course (such as the Saylor FoundationĺÎĺ_ĺĚĺ_s MA231) before taking this course. Upon successful completion of this course, students will be able to: explain how symmetric and asymmetric key ciphers work; list and define cryptographyĺÎĺ_ĺĚĺ_s goals; list and define the most common classical ciphers; explain the workings of mechanical ciphers Enigma and Lorenz; describe the principles of substitution-permutation networks; describe the algorithms for data encryption and the advanced encryption standard; describe and use the MD5 and SHA-1 hash functions; explain the idea behind public key cryptography; use the RSA cryptography system by applying it to practical problems; test whether the large integer is prime with the mathematical tools presented in this course; define the elliptic curve and use it in cryptography; explain the Diffie-Hellman key exchange; describe the most common signature and autokey identity schemes; describe the conceptual workings of public key infrastructure. This free course may be completed online at any time. (Computer Science 409)
This breakout activity provides teachers and students an interactive way to demonstrate their learning about cryptography, code-breaking, and historic ciphers. Clues are provided, along with additional hints you can choose to provide to students so that students solve ciphers and learn what time their army is planning to raid the enemy camp.
In this lesson, students will learn about one of the most significant and successful spy rings in American History. They will also actually conduct some of the same techniques and demonstrate them to the rest of the class.
WW2 Encryption is explored with a focus on the Enigma. Read more here. Created by Brit Cruise.
Brit introduces the polyalphabetic cipher, which creates a lighter fingerprint than the Caesar cipher. Created by Brit Cruise.
The perfect cipher. Created by Brit Cruise.