Digital image encryption and decryption system based on visual password

Abstract

The invention discloses an image encryption and decryption method and an image encryption and decryption system based on a Visual Code and by adopting a Burch coding correction type off-axis referencelight computer generated hologram principle (CGH for short). The original image is encrypted by adopting a visual password technology, two encrypted sharing images are generated by using the originalimage, holograms corresponding to the two sharing images are obtained by using CGH during decryption, and light fields of the two holograms are respectively reconstructed and superposed to obtain a decrypted image. A novel secret sharing technology is adopted, and encryption safety and decryption reliability are enhanced for the condition that secret information is an image; meanwhile, differentfrom the traditional visual cryptography method, the hologram generated by the CGH cannot be directly superposed to obtain the original image, so that the confidentiality is further enhanced; experiments prove that the safety performance of encryption and decryption is excellent.

Description

technical field [0001] The invention relates to the technical field of digital image encryption, in particular to the technical field of air domain image encryption. Background technique [0002] Digital image is a widely used form of information carrier, which has a profound impact on national defense, industry, science and technology, economy and other fields. In some special fields, such as military, commercial and aviation, digital images still have high confidentiality requirements. Facing the rapid development of decryption technology, traditional one-dimensional data encryption algorithms are facing severe challenges. The concept of image encryption technology is: a technology that uses the characteristics of digital images to design encryption algorithms to improve encryption security and operational efficiency. In order to meet the needs of practical applications, digital image encryption technology needs to be difficult to decipher and reliable in performance, so...

AI Technical Summary

Problems solved by technology

[0005] The existing visual cryptography technology can achieve concealment, because the pixels on the shared image are randomly distributed, the hidden secrets cannot be seen by ordinary people; secondly, the visual cryptography technology is safe: the analysis of a single shared image cannot get any useful information about the secret

[0006] However, most of the existing visual cryptography techniques do not require any mathematical calculations when decrypting, and the cracker does not need any mathematical knowledge, as long as the shared images are simply superimposed, the secret image can be recovered, which increases the risk of being photographed during the preservation of the shared image. The risk of theft, thereby reducing the security of traditional visual cryptography

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