Substitution ciphers are a type of monoalphabetic cipher where each letter in the plaintext is replaced with another letter or symbol. To decrypt such a cipher, one must determine the correct mapping ...

This project implements a monoalphabetic substitution cipher using a randomly shuffled key mapping. Unlike the Caesar Cipher, which shifts characters by a fixed amount, this method generates a random ...

Abstract: Cipher index is a well established technology for improving query efficiency. But existing cipher index schemes are aimed at numeric data. Thus, a Character Mapping Cipher Index Scheme ...