CRYPTOGRAPHY / MONOALPHABETIC CIPHER

Affine Cipher

Encrypt, decrypt, validate keys, and rank every valid key pair locally.

Affine Decoder

Ciphertext

Alphabet (unique characters)

Multiplier A

Shift B

Best plaintext

Plaintext

Ciphertext result

Multiplier A

Shift B

A must be coprime with the alphabet length. Punctuation is preserved.