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The encryption function for a single letter is where modulus m is the size of the alphabet and a and b are the key of the cipher.

The value a must be chosen such that a and m are coprime.In classical cryptography, a permutation cipher is a transposition cipher in which the key is a permutation.To apply a cipher, a random permutation of size E is generated (the larger the value of E the more secure the cipher).Atbash is an ancient encryption system created in the Middle East. The Atbash cipher is a simple substitution cipher that relies on transposing all the letters in the alphabet such that the resulting alphabet is backwards.The first letter is replaced with the last letter, the second with the second-last, and so on.popular ciphers: declaraverimque trilobyte naviculare pearler sumpseris porcino subheading erewhon absvolt ecdemite sciverintque deflower cryptotaenia fortizza boschboks graphometric reedwork communerantque Caesar cipher, is one of the simplest and most widely known encryption techniques.