A Novel Approach for a Multi-level Secure DNA Based Cryptographic Model

Abstract

Information technology is growing day by day and security of information from unauthorized access is a major concern in today’s security requirements. Cryptography is the art of hiding secret message to a format called cipher text in which no person other than sender or receiver is able to decode it. We already proposed a method of DNA digital coding technology and this paper elaborates the detailed design, implementation and analysis of the model enhancing the message security. The crucial attraction of this extended paper is providing multi-level security of 3 levels with round key selection and message encryption in level 1 followed by 16×16 matrix manipulation using asymmetric key encryption in level 2 and shift operations in level 3. By using 16x16 expansion matrix as key, the scheme improves the independence and the strict avalanche effect without compromising complexity and size of the cipher text. Although this model increases the computation amount because of using the matrix operation, the round key generation ensures better and enhanced security of the secret message.