Homophonic Substitution Cipher
The Homophonic Substitution cipher is a classical substitution cipher designed to replace each plaintext character with one of several possible ciphertext symbols, reducing the effectiveness of frequency analysis. While its exact origins are unclear, it became widely studied in the 16th and 17th centuries and was employed in diplomatic and military communications to obscure letter frequencies. In this cipher, high-frequency letters like E or T are assigned multiple ciphertext equivalents, while less frequent letters may have only one.