All ciphers are a form of the substitution cipher. Variations of ciphers, such as the P cipher, block ciphers, and product ciphers have been introduced in an effort to hide the patterns that filter ...

It is divided into two tasks: breaking a substitution cipher using frequency analysis, and manipulating an OTP-encrypted message to forge a different plaintext without decrypting it. Task 1: ...

Caesar Cipher - Python This is a basic Python implementation of the classic Caesar Cipher encryption algorithm. The Caesar Cipher is a substitution cipher where each letter in the plaintext is shifted ...

This paper proposes an image encryption algorithm based on hash table structure scrambling and DNA substitution. The algorithm uses the classical `scrambling-diffusion' process, and the pseudo-random ...