Quantum chaos image encryption method based on bit scrambling

Abstract

The invention discloses a quantum chaotic image encryption method based on bit scrambling. The method comprises steps: a Logistic quantum chaotic system is used for generating a chaotic sequence, bit scrambling is carried out on R, G and B three-primary color component pixel values of an original image p, and a middle scrambling image I is obtained; and then, encryption operation is carried out on the middle scrambling image I, and a final encryption image q is obtained. The encryption method of the invention greatly increases the secret key space, the safety, the encryption effect and the secret key sensitivity are higher, the anti-attack ability is stronger, and the deciphering difficulty is greatly improved.

Description

technical field [0001] The present invention relates to an image encryption method, and more specifically relates to a quantum chaos image encryption method based on bit scrambling. Background technique [0002] It is proposed in cryptography that a good encryption method should not only have a large enough key space, but also be extremely sensitive to the plaintext key, and adjacent data should be irrelevant, and the encrypted information should be evenly distributed. These characteristics are to resist exhaustive attacks , differential attack, and other attack methods. [0003] In 2008, a hyperchaotic image encryption method based on scrambling and substitution structure was mentioned for the first time. At this stage, the following three new types of chaotic image encryption methods are proposed: [0004] 1. An image encryption method based on a complex chaotic system, for example: Zhu Congxu proposed a two-time diffusion encryption method based on a hyperchaotic system ...

AI Technical Summary

Problems solved by technology

[0007] In this kind of image encryption method, since the intermediate key has nothing to do with the plaintext, it is not well defended against the plaintext chosen attack

Since then, some people have improved the method, but it only adds feedback when replacing the pixel value in the algorithm, which has nothing to do with the plaintext, and the defense effect on the plaintext choice attack is not good.

In general, this kind of encryption method has some more or less defects, resulting in poor defense against chosen ciphertext and chosen plaintext attacks. Many methods based on the above theories have been deciphered by chosen plaintext attacks.

In the existing chaotic image encryption method, due to the loss of precision caused by the computer's floating-point number operation, the chaos will appear periodically, so this kind of chaotic image encryption method cannot be well applied in practice.

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