Color Image Encryption Based On Gyrator Transform And DNA Computing

With the rapid development of Internet technology, communication technology has made great progress. However, because of the openness and sharing of the Internet, and stealing sensitive information of images through the Internet, the security and privacy of multimedia information become more and more important. Recently, image encryption is one of the most effective ways to protect image information.The major work in this paper includes:1. In the paper, we make notes on research background, purposes, significance and value of digital image encryption. Image scrambling theory is described in detail which includes chaos theory, DNA cryptography theory and gyrator transform. The existing image encryption schemes are analyzed, including gray image encryption based on gyrator transform and random phase encoding, image encryption based on gyrator transform and chaotic scrambling, image watermarking using gyrator transform and chaotic maps, color image encryption scheme by gyrator transform and color image encryption based on DNA and chaotic maps.2. Quaternion gyrator transform is deduced in this paper. A new color image encryption algorithm based on quaternion gyrator transform, affine transform and chaotic systems is proposed. By comparison, security of the proposed algorithm is better.3. A novel image encryption algorithm based on chaotic DNA computing method is presented. In this algorithm, Chaotic sequence is used for the permutation by sorting, which generated by One-dimensional Logistic map and Chebyshev map. Then, the permuted image and random integer sequence are generated using chaotic sequence and DNA encoding. And encrypted matrices are obtained by using DNA addition rule. At last, DNA-encrypted matrices are added by using DNA addition operation with a new matrix generated by other different parameters. The DNA-encrypted matrices are decoded using DNA decoding rule and encrypted color image is produced.It has carried out security analysis and computer simulation for all algorithms in this paper. The security analysis and simulation experimental results indicate the proposed algorithms have good encryption effect, a larger secret key space, and the ability of resisting exhaustive attack and statistical attack. It proves that the proposed algorithms are effective algorithms.