Novel Chaotic Image Encryption Using Dynamic DNA Coding

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 ranges, much larger Lyapunov exponent and more complex behavior. Then, a novel image cryptosystem based on the proposed map and dynamic DNA encoding is designed. Compared other DNA encoding image encryption methods, 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 recent related chaos-based image encryption schemes, the proposed cryptosystem has higher security.