‣ The Polyalphabetic substitution
cipher comes from the greek word poly means several, so Polyalphabetic cipher means a secret code based on several letters.
Polyalphabetic is a simple extension of the monoalphabetic substitution cipher. In some cases the multiple alphabets are just rotations of the existing alphabet. This generates an encrypted ciphertext that cannot be solved by simple frequency analysis, because the mapping of plaintext letters to ciphertext letters is one-to-many, which is to say the plaintext letters have different ciphertext corespondents at different places in the text.
In other words, the cipher alphabet changes throughout the encryption and the letter is encrypted to a different ciphertext letter each time.
For example: The letter C may be encoded as the letter K for the first part of the message, but later on it may be changed or encoded as the letter R.
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DECIPHER: A Compilation of codes and ciphers
Random✘ - - - DECIPHER is a book compilation that tackles different, new and old codes/ciphers. In addition, this book begins with the definition of cryptography along with it's different terminology for begginers, and better understanding. Interested? W...
