Multi-image encrypting and decrypting method based on ghost imaging and public key cryptography

Abstract

The invention relates to a multi-image encrypting and decrypting method based on ghost imaging and public key cryptography. The encrypting method includes the steps that at least one light path is sequentially arranged along a light path, and each light path is sequentially provided with a spatial light modulator (SLM), an image to be encrypted and a convex lens so that all the light paths can be converged to one barrel detector; the SLMs are controlled to generate different random phase plates so as to obtain all detection data, encryption is conducted through calculation based on a public key encryption algorithm, and a ciphertext is obtained. The decryption method includes the steps that the ciphertext and random phase plate information are received, and data are obtained by decrypting the ciphertext through a private key; light intensity information of the random phase plates in Fresnel areas of the random phase plates is obtained, data including all pieces of plaintext information are correlated to the light intensity information corresponding to the images, calculation is conducted, and decryption is conducted. According to the multi-image encrypting and decrypting method, an optical system is simplified, any images can be encrypted at the same time, mutual crosstalk does not exist among the images, and the number of the encrypted images does not affect the definition of the decrypted images.

Description

technical field [0001] The invention relates to a multi-image encryption and decryption method based on ghost imaging and public key encryption, belonging to the field of optical information security. Background technique [0002] In recent years, with the continuous improvement of computer computing speed and the rapid development of modern network and communication technology, the traditional information security technology that completely relies on cryptography and electronic information systems is facing increasingly severe challenges. However, in contrast, information security technology based on optical theory and methods has unique advantages such as fast parallel data processing capabilities, multi-dimensional (amplitude, phase, polarization, wavelength), large capacity, high robustness, and large key space. More and more researchers have turned their attention to the emerging field of optical information security. [0003] Among all kinds of information, images are...

AI Technical Summary

Problems solved by technology

However, the current image encryption technology based on ghost imaging is all for the encryption of a single image, while the research on multi-image encryption technology is quite scarce.

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