Text Encryption: Hybrid cryptographic method using Vigenere and Hill Ciphers

Abstract

Cryptography is a method of controlling and protecting communications, which has been used exclusively in areas that require confidentiality. Today it is undergoing a considerable evolution, and computer networks require a phase of cryptography as a fundamental mechanism to ensure the privacy of digital information. It was beginning with the first Cesar encryption algorithm or those that appeared just afterwards, such as mono-alphabetic substitution encryption, which has a weakness against statistical attacks. In this paper, we will present a hybridization of Vigenere and Hill encryption that belongs to this family. By exploiting the enhancements, they have already implemented in Hill encryption, to hide the weak point of the Vigenere algorithm, represented in the ease to detect the size of the key to start a statistical attack, as well as the weakness of the algorithm to encrypt two same letters located in the same place in different blocks. This cohesion between these two methods will provide us with a reliable hybrid algorithm, resistant to varying attacks, including statistical attacks.