CEASAR CRYTOGRAPHY ASSIGNMENT

Cryptography is the art of protecting information by transforming it (encrypting it) into an unreadable format, called cipher text. Only those who possess a secret key can decipher (or decrypt) the message into plain text. Encrypted messages can sometimes be broken by cryptanalysis, also called code-breaking, although modern cryptography techniques are virtually unbreakable.

As the Internet and other forms of electronic communication become more prevalent, electronic security is becoming increasingly important. Cryptography is used to protect e-mail messages, credit card information, and corporate data.

Cryptography systems can be broadly classified into symmetric-key systems that use a single key that both the sender and recipient have, and public-key systems that use two keys, a public key known to everyone and a private key that only the recipient of messages uses.

Figure 9 - Cryptography Freemason Cipher Figure 9 is a diagram depicting the basis for the cipher. It was written by using the cell for each letter. There is an example of which cells are used to spell the word mason. With a few minutes of study, and by memorizing the cipher, you can now read or write in the Freemasons Cipher.

ABOUT SHIFTED CIPHERS: Among the most common of the classical cryptosystems are the shifted ciphers, in which the original message was shifted to create a secret (i.e. encrypted) message. An example of a shifted cipher is the Caesars Cipher, where the secret message is generated by shifting forward every single character in the original message by 3 (e.g. A becomes D, B becomes E, and so on...). For decryption, every character in the secret message is to be shifted back by 3 in order to obtain the original message. The transformation can be represented by aligning two alphabets; the cipher alphabet is the plain alphabet rotated left or right by some number of positions. For instance, here is a Caesar cipher using a left rotation of three places, equivalent to a right shift of 23 (the shift parameter is used as the key): Plain: ABCDEFGHIJKLMNOPQRSTUVWXYZ Cipher: XYZABCDEFGHIJKLMNOPQRSTUVW When encrypting, a person looks up each letter of the message in the "plain" line and writes down the corresponding letter in the "cipher" line. Plaintext: THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG Ciphertext: QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD Deciphering is done in reverse, with a right shift of 3.

ASSIGNMENT. Create a .txt, .doc, .pdf or similar file. Name the file as YourLastName Caesar. In the top left corner of your document type your full name and the words Caesar Shift. Write your answers to the two challenges below, and submit your completed document to this assignment forum.

Using the Caesar 3 Character Left Shift encryption algorithm, solve the following Ciphers:

Plaintext: CYBERSECURITY ESSENTIALS COURSE

Ciphertext: _______________________________________________________________________________

Ciphertext: KBUQ DBKBOXQFLK PBZROFQV

Plaintext: _________________________________________________________________________________