Abstract
In this paper, we construct a five dimensional continuous hyperchaotic system and propose an image encryption scheme based on the hyperchaotic system, which adopts DNA dynamic coding mechanism and classical scrambling diffusion encryption structure. In the diffusion stage, two rounds of diffusion are adopted and the rules of DNA encoding (DNA decoding) are dynamically changed according to the pixel value of the plaintext image, that is, the rules of DNA encoding (DNA decoding) used to encrypt different images are different, which makes the algorithm can resist chosen-plaintext attack. The encryption (decryption) key is only the initial value of the chaotic system, which overcomes the difficulty of key management in the “one time pad” encryption system. The experimental results and security analysis show that the algorithm has some advantages of large key space, no obvious statistical characteristics of ciphertext, sensitivity to plaintext and key and able to resist differential attacks and chosen plaintext attack. It has good application prospects.
Highlights
In recent years, with the rapid development of computer and network technologies, great changes have taken place in the means of communication; media communication has gradually become an important means of information exchange
This paper proposes a dynamic DNA coding method, that is, according to the random matrix generated by the chaotic system, the pixels at different positions are adopted different DNA coding rules in the eight DNA
The algorithm consists of two stages: scrambling stage and two rounds of diffusion stage
Summary
With the rapid development of computer and network technologies, great changes have taken place in the means of communication; media communication has gradually become an important means of information exchange. Compared with traditional encryption algorithms, image encryption algorithm based on chaos theory has more advantages in security, complexity and speed [4,5,6,7,8,9] In recent years, it has gradually become a hot research topic [10,11,12,13,14]. Gehani et al proposed an image encryption method with “one-time pad” effect based on DNA coding, which can resist the attack of chosen-plaintext (ciphertext) [32]. In order to enhance security, this paper proposes an image encryption algorithm based on hyperchaos and dynamic DNA coding.
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