Color Image Encryption Method Based on Latin Square Scrambling

Abstract

The invention relates to a color image encryption method based on Latin square scrambling. Plaintext keys r1, g1 and b1 are calculated through utilization of R, G and B components of a color plaintextimage, an initial value and a parameter obtained through calculation based on the keys are substituted into a chaotic system, and three groups of chaotic sequences are generated; the chaotic sequences for scrambling and diffusion are selected through utilization of a chaotic sequence selection mechanism based on the plaintext and digital arrangement; and a final ciphertext image is obtained through adoption of a block scrambling policy based on a Latin square and the chaotic sequences, and diffusion operation based on the plaintext and a scrambled image. The encryption method is closely related to the plaintext, so the plaintext attack resistance is improved. The employed chaotic system is an improved chaotic system, a chaotic characteristic is good, the randomness is high and a key spaceis great, so a security level is further improved. A simulation result and safety analysis show that according to the encryption provided by the invention, an image complete encryption demand can besatisfied, the encryption efficiency is high, and the robustness is high.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a color image encryption method based on Latin square scrambling. Background technique [0002] With the rapid development of digital technology and network technology, more and more multimedia data is generated, transmitted through the network and stored on platforms such as cloud servers. Digital images contain a lot of information. For example, a picture of a military oil depot can not only tell us its size and quantity, but also give its approximate location; Give approximate age and physical condition. Therefore, in medical image systems, military image systems and video conferencing, protecting the security of image data has attracted widespread attention, and image encryption is a method that can effectively protect data security. At present, there are two main problems in the color image encryption algorithm: one is the low correlation between the algorithm and...

AI Technical Summary

Problems solved by technology

At present, there are two main problems in the color image encryption algorithm: one is the low correlation between the algorithm and the plaintext, and the ability to resist attacks such as selected plaintext is poor; the other is that some algorithms do not consider the correlation between R, G and B components, so The proposed algorithm is vulnerable to statistical analysis

Therefore, many scholars have been looking for more effective ways to protect pictures. The encryption process and key in the algorithm proposed by Sun et al. have nothing to do with the plaintext, which was cracked by Liu et al. using known plaintext attack; Zhang et al. used the improved Cat The mapping encrypts the three components of the color plaintext image respectively, but it is cracked by Liu et al. using chosen plaintext and known plaintext attacks; Low correlation, vulnerable to attacks

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