Multi-sized Multiple Text File Encryption System using One-dimensional Chaotic Map

Abstract

This paper proposes a text encryption system to encrypt multiple text files of arbitrary sizes. The proposed work uses one-dimensional piece-wise linear chaotic map (PWLCM) to perform multi-sized multiple text file encryption. In the method, a group of text files is partitioned into number of sections, each one with 4-text elements. The text elements in each of the sections are then arranged into dimensional text blocks. All the blocks and the remaining text elements (if any) are arranged in a separate array. Finally, the array of blocks and remaining text elements are permuted and diffused using two different PWLCM systems. The SHA-256 hash function is used to generate the keys to prevent the proposed cryptosystem against chosen-plaintext and known-plaintext attacks. The computer simulation reveals the good encryption results of the multi-sized multiple text file encryption system. The security analysis confirms the stronger resistivity of the proposed algorithm against the most widely used security attacks.