An Enhanced Polyalphabetic Algorithm on Vigenerecipher with DNA-Based Cryptography

Several algorithms were introduced in data encryption and decryptionsto protect threats and intruders from stealing and destroying data. A DNA cryptography is a new concept that has attracted great interest in the information security. In this paper, we propose a new enhanced polyalphabetic cipher algorithm (EPCA) as enhanced algorithm for the Vigenere cipher to avoid the limitations and the weakness of Vigenere cipher. A DNA technology is used to convert binary data to DNA strand. We compared the EPCA with Vigenere cipher in terms of memory space and run time. The EPCA has theoretical run time of O(N), at worst case. The EPCA shows better performance in average memory space and closed results in average running time, for the tested data.