Abstract
Recently, an image encryption algorithm based on random walk and hyperchaotic systems has been proposed. The main idea of the original paper is to scramble the plain image by means of random walk matrix and then to append diffusion. In this paper, the encryption method with security holes is analyzed by chosen plaintext attack. In addition, this paper improves the original encryption algorithm. The experimental and simulation results show that the improved algorithm has the advantages of the original and can improve the ability to resist attack.
Highlights
With the development of the Internet and cryptography, communication encryption has attracted the attention of many researchers and has been applied in many fields [1,2].At the same time, the number of images transmitted over the Internet is increasing all the time [3]
When Fridrich [5] first applied the structure of permissive diffused junction encryption to image encryption, many chaotic image encryption schemes based on it appeared [6,7,8,9,10]; because the encryption algorithms have security holes, or only use one round encryption, it is extremely vulnerable to be cracked by chosenplaintext attacks [11,12,13]
The encryption scheme based on the random walk and hyperchaotic system has the advantage of the average value of pixels related to plaintext, which can be used as the diffusion basis to resist the general attack scheme
Summary
With the development of the Internet and cryptography, communication encryption has attracted the attention of many researchers and has been applied in many fields [1,2]. Li et al [17] improved the security of the system through multiple rounds of encryption related to plaintext. Some plaintextrelated encryption algorithms [23,24,25] are attacked by chosen plaintext because of the small key space. Researchers [29,30,31,32] integrate the plaintextrelated hash function into the encryption algorithm to increase the key space, resulting in the failure of traditional chosen plaintext attacks. Due to the random walk matrix used for the scramble, the initial position and direction of the motion are controlled by the random numbers obtained from the chaotic system, with a significantly better safety performance than other encryption schemes mentioned above. The special point of this paper is to verify whether the chaotic encryption of multiple random sequences in the scrambled stage and diffusion stage is invalid.
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