Novel Chaotic Image Cryptosystem Using Dynamic DNA Coding

Abstract To solve the problem of a small key space of image cryptosystem based on logistic, this paper presents a new 1D chaotic map with a wider and continuous chaotic range, much larger Lyapunov exponent and more complex behavior. Using the proposed one-dimensional chaotic map, an image cryptography algorithm is developed. In this paper, a novel image cryptosystem based on the proposed map and dynamic DNA encoding is designed, which is different from other DNA encoding method. Our method is based on chaotic sequences to obtain complex DNA sequence, and it is calculated with our plaintext image DNA sequence, which not only plays a good encryption effect. Moreover, our dynamic DNA coding process is simple, easy to operate and implement with good effect. Experimental results presented that compared with the fixed DNA and some recent chaos-based image encryption schemes, the proposed cryptosystem has higher security.