Affine
The Affine Cipher is a type of monoalphabetic substitution cipher that combines multiplication and addition operations to transform plaintext letters into ciphertext. Each letter x in the plaintext is first converted to a numeric value, typically A=0 through Z=25, and then encrypted using the function E(x) = (ax + b) mod 26, where a and b are keys chosen such that a is coprime with 26.
A1Z26
The A1Z26 Cipher is a straightforward substitution cipher in which each letter of the alphabet is replaced by its corresponding numerical position. Specifically, A=1, B=2, C=3, continuing through Z=26. This simple mapping transforms plaintext into a sequence of numbers, creating a numeric representation of the original message while maintaining a direct, one-to-one correspondence between letters and values.