Plaintext-Dependent Selective Image Encryption Scheme Based on Chaotic Maps and DNA Coding

摘要

With the rapid development of Multimedia technology, the secure transmission of digital images over the Internet has become more and more important issue. To guarantee the security, a new selective image encryption scheme based on chaotic maps and DNA coding has been proposed in this paper. Selective image encryption means that only the front four most significant bits of each image pixel is encrypted, so it can reduce half of image data and improve the encryption speed. XOR 192 bits plain information extracted from the least significant bits of the pixels with the secret key to influence the encryption process, so it is plaintext-dependent, which is an efficient to resist the chosen-plaintext attack. The extreme sensitivity of Logistic and Spatiotemporal chaotic system can greatly increase the complexity of the proposed selective image scheme. Eight DNA coding rules are mixed to enhance the efficiency of image confusion and diffusion. Experimental simulation and analysis demonstrates the high security to resist different attacks and high efficiency with fast encryption speed, which can be practical in real applications.