BMP image encryption and decryption method and device for self-synchronizing chaotic stream password

Abstract

The invention discloses a BMP image encryption and decryption method and device for a self-synchronizing chaotic stream password. The method comprises the steps of S100 decomposing an original BMP format color image into RGB three-channel data; S200 generating three groups of encrypted pseudo-random sequences by using a self-synchronizing chaotic flow cryptosystem; S300 respectively encrypting each RGB datum of the color image by utilizing the generated three groups of pseudo-random sequences; and S400 synthesizing the encrypted RGB three-channel data into an encrypted image in a BMP format. The invention further discloses a decryption method. According to the image encryption and decryption method, the generation of the pseudo-random sequence is closely related to the ciphertext data. Compared with a similar method, the method enhances the security of the BMP image.

Description

technical field [0001] The invention relates to the technical field of image encryption and decryption, in particular to a method and device for BMP image encryption and decryption of self-synchronized chaotic stream ciphers. Background technique [0002] With the development of broadband Internet, handheld devices and other technologies, digital images are widely disseminated in daily life, and its security issues are increasingly concerned by people. In special fields such as military industry and medical treatment, there are more requirements for high confidentiality. The most effective way to prevent data leakage is encryption. For applications with high requirements on image quality, lossless compression technology is required, and airspace image encryption technology emerges as the times require. As one of the three new cryptographic techniques, chaotic cipher has many applications in this field, but some cryptanalysis work points out that some existing chaotic image...

AI Technical Summary

Problems solved by technology

As one of the three new cryptographic techniques, chaotic cipher has many applications in this field, but some cryptanalysis work points out that some existing chaotic image encryption methods have insufficient security performance, most of which are generated by chaotic systems The pseudo-random sequences are all fixed, and the self-synchronized chaotic stream cipher system can make the pseudo-random sequences generated by it change with the input plaintext image, while ensuring the limited propagation of errors

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