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Method and apparatus for obtaining equivalent key of random phase coding-based optical encryption system

An encryption system and random phase technology, applied in the field of optical cryptanalysis, can solve the problems of reducing the efficiency of optical cryptanalysis, increasing the complexity of the actual device, and the inability to directly record and save the complex amplitude distribution, and achieve a simple method and low system cost. Effect

Active Publication Date: 2017-02-15
SHENZHEN UNIV +1
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Problems solved by technology

The biggest disadvantage of this method is that the point spread function of the system that needs to be recorded is a complex amplitude distribution (including amplitude and phase), and the complex amplitude distribution usually cannot be directly recorded and saved, and it needs to be recorded by an additional interferometric device or other phase measurement device , so this method will increase the complexity of the actual device in practical applications and reduce the efficiency of optical cryptanalysis

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  • Method and apparatus for obtaining equivalent key of random phase coding-based optical encryption system

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[0043] Further description will be given below in conjunction with the accompanying drawings and embodiments.

[0044] The following embodiments provide a device for obtaining an equivalent key of an optical encryption system based on random phase encoding.

[0045] The optical encryption system based on random phase encoding and linear canonical transformation can be represented by a general model. Such as figure 1 As shown, let M 1 , M 2 ,...,M i Respectively represent random phase templates, they are statistically independent from each other and act as the key of the encryption system. In order to simplify the description, we omit the relevant coordinate parameters in the following expressions.

[0046] Usually the plaintext is placed on the input plane of the encryption system. When the entire system is illuminated with coherent light, the complex amplitude distribution on the output plane of the encryption system is used as the ciphertext of the encryption system; w...

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Abstract

The present invention relates to a method and apparatus for obtaining the equivalent key of the random phase coding-based optical encryption system. The apparatus includes a point light source structure, an optical 4f structure, a pure phase space light modulator and a feedback control device. According to the apparatus, the phase modulation parameter of the pure phase space light modulator is adjusted, so that the light intensity of the center of an output surface image can be maximum, and the phase modulation parameter is adopted as the equivalent key of the optical encryption system. According to the method, modulation is completed through the apparatus. With the method and apparatus adopted, the equivalent key of the optical encryption system parameter can be obtained simply, and cost is low.

Description

technical field [0001] The invention relates to optical cryptanalysis in the technical field of optical cryptography, in particular to a method and device for obtaining an equivalent key of an optical encryption system based on random phase encoding. Background technique [0002] Data encryption based on optical theory and methods is a new generation of information security technology that has started to develop internationally in recent years. Compared with traditional computer cryptography and information security technology, optical information security technology has many advantages such as multi-dimensionality, large capacity, high degree of freedom, high robustness, and natural parallelism. The optical encryption system based on Double Random Phase Encoding (DRPE) proposed by Refregier and Javidi in 1995 is the most classic optical image encryption system. Since this work was reported, encryption techniques based on optical means have flourished. The DRPE-based optic...

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Application Information

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IPC IPC(8): H04L9/08G06F21/46
CPCG06F21/46H04L9/0861
Inventor 何文奇廖美华彭翔卢大江何江涛
Owner SHENZHEN UNIV
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