Indirect vision password scheme achieved with photoelectricity method

Abstract

The invention discloses an indirect vision password scheme achieved with a photoelectricity method. On the basis of a vision password scheme technology, a subgraph obtained by coding is made into a corresponding subgraph pure phase plate through software; the subgraph pure phase plate is modulated into a corresponding subgraph through a spatial light modulator, the subgraph is received by a receiving unit, software is used for adding received subgraph images, and human eye decryption is carried out; or the subgraph pure phase plate is made into a dynamic graph, the spatial light modulator is used for modulating the subgraph pure phase plate into a subgraph dynamic graph which is received by the receiving unit, receiving unit exposure time is adjusted to achieve subgraph adding in an equivalent mode, and human eye decryption is carried out. The pure phase plate is used as decryption cryptograph, diffraction effect is introduced, a whole system is complete, so that invisibility is good, anti-noise capacity is high, aligning can be well achieved, meanwhile, operation is easy and convenient, the problems that the vision password scheme is poor in invisibility, and multiple application restricts exist are effectively solved, and the indirect vision password scheme can be used in the field of information encryption with high safety and system integration requirements.

Description

technical field [0001] The invention relates to a visual encryption scheme, in particular to an indirect visual encryption scheme technology based on a pure phase element, utilizing the electro-optical modulation effect of a spatial light modulator, and adopting a photoelectric method through diffraction. Background technique [0002] Visual cryptography is a technique related to image encryption. He provides a way to divide an image carrying information to be encrypted into multiple encrypted sub-images, as long as the number of sub-images specified by the rules are precisely aligned and superimposed together, without any cryptographic calculations, it can be obtained by relying on human eyes A scheme for encrypting information. [0003] The technology originally originated from the Moore phenomenon of lattices proposed by Leon Glass in 1969, see (Nature 223:578-580, 1969). The article pointed out that when a random lattice pattern is rotated at a small angle along the ce...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of existing visual cryptography schemes, solve the problem of obvious targetness of decrypted ciphertext in visual cryptography schemes, poor concealment, insufficient security, and encryption systems that require more auxiliary systems, which are not convenient for system integration and application, etc. question

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