Image Encryption Based on DNA Substitution and Chaotic Theory

In the present era, the progression of the Internet has given a huge impetus to the sharing of multimedia over various communication channels. But the data once distributed over the communication network is prone to several security risks. To handle these security risks, various encryption algorithms have been proposed to date. In this chapter, a new color image encryption algorithm is presented using DNA sequence substitution and chaos. The work suggested in this chapter is aimed at strengthening the encryption to improve the security of the system. A DNA sequence obtained from an RGB image is encrypted using a random DNA sequence. This encryption is performed using DNA substitution. Further, this encrypted sequence is doubly secured by performing the XOR operation of this sequence with a sequence generated using chaos. The result of this conversion is an encrypted RGB image. Thus, the encrypted image is doubly secured using the proposed algorithm. The evaluation of the algorithm presented in this chapter shows strong key sensitivity along with large key space and can be seen from the experimental results. The results obtained for the proposed method stand testimony that the proposed technique shows high resistance to statistical attacks and thus can prove to be a good candidate for image encryption.KeywordsImage encryptionDNA sequenceSubstitution methodChaosChaotic sequence