A Modern Hill Cipher Involving a Pair of Keys, XOR operation and Substitution

In this investigation, we have developed a block cipher. This includes a pair of keys for strengthening the cipher. In the development of the cipher, we have used iteration process, and a pair of functions called mix() and substitute() in each round of the iteration process. These functions modify the plaintext in various ways before it takes the shape of the ciphertext. The avalanche effect and the cryptanalysis examined in this analysis clearly indicate that this cipher is a strong one.