Braingle: Codes, Ciphers, Encryption and Cryptography [PDF]

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MONOALP HABE TI C

Caesar Cipher Atbash Cipher Keyword Cipher Pigpen / Masonic Cipher Polybius Square P OLY ALP HABE TI C

Vigenère Cipher Beaufort Cipher Autokey Cipher Running Key Cipher P OLY GRAP HI C

Playfair Cipher Bifid Cipher Trifid Cipher Four-square cipher TRANS P OS I TI ON

Rail Fence Route Cipher Columnar Transposition MI S CE LLANE OUS

Book Cipher Beale Cipher Morse Code Tap Code One-time Pad Scytale Semaphore ASCII Code Steganography TE CHNI QUE S

Frequency Analysis Books

Codes, Ciphers, Encryption and Cryptography Cryptography is the discipline of using codes and ciphers to encrypt a message and make it unreadable unless the recipient knows the secret to decrypt it. Encryption has been used for many thousands of years. The following codes and ciphers can be learned and used to encrypt and decrypt messages by hand. M O NO AL PHABET I C CI PHERS

PO L YAL PHABET I C CI PHERS

A monoalphabetic cipher is a substitution cipher that uses the same substitution across the entire message. For example, if you know that the letter A is enciphered as the letter K, this will hold true for the entire message. These types of messages can be cracked by using frequency analysis, educated guesses or trial and error.

In a polyalphabetic cipher, the substitution of one letter for another may change throughout the message. For example, the letter A may be encoded as the letter K for part of the message, but later on it might be encoded as the letter W. Vigenère Cipher Beaufort Cipher Autokey Cipher Running Key Cipher

Caesar Cipher Atbash Cipher Keyword Cipher Pigpen / Masonic Cipher Polybius Square

PO L YG RAPHI C CI PHERS

T RANSPO SI T I O N CI PHERS

Instead of substituting one letter for another letter, a polygraphic cipher performs substitutions with two or more groups of letters. This has the advantage of masking the frequency distribution of letters, which makes frequency analysis attacks much more difficult.

Unlike substitution ciphers that replace letters with other letters, a transposition cipher keeps the letters the same, but rearranges their order according to a specific algorithm. Rail Fence Route Cipher Columnar Transposition

Playfair Cipher Bifid Cipher Trifid Cipher Four-square cipher

O T HER CI PHERS AND CO DES

T ECHNI Q UES AND RESO URCES

There are lots of other interesting codes and ciphers that have been used throughout history.

There are many different techniques that you can use to crack an encryption. Here we have one of them and a list of useful books that you can pick up to learn more.

Book Cipher Beale Cipher Morse Code Tap Code One-time Pad Scytale Semaphore ASCII Steganography

Frequency Analysis Cryptography Books

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