A DNA cryptographic technique based on dynamic DNA sequence table

Abstract

This paper proposes a new technique for DNA cryptography that uses dynamic DNA sequence table to enhance the level of security. While handling with secure data, the requirements like compression, speed-up computation and processing etc are crucial issues. Bio-molecular DNA features possess the capability to cope up with these requirements. Existing DNA cryptographic techniques usually consider fixed DNA sequence table i.e., DNA bases and thereby the security is suspected to be breached by the intruder. To overcome this limitation, the proposed technique considers dynamic sequence table that assigns random ASCII characters to DNA sequence table initially. Then a finite number of iterations are applied based on a mathematical series where in every iteration the positions of ASCII characters are changed dynamically in the sequence table. Later on, One-Time-Pad (OTP) is applied on the modified encoding binary value. Again OTP ciphertext is processed through genomic conversion. Finally, it is converted into compressed ciphertext using amino acid table consisting of protein sequence that increases the confusion of the ciphertext. At last, the time requirements for encoding-decoding and encryption-decryption are evaluated and comparisons with other DNA techniques are presented.