Pure phase based optical encryption-decryption system

Abstract

A pure phase based optical encryption-decryption system comprises optical devices including optical devices such as a coherent light source. Light beams outputted by the coherent light source are split into two paths through a collimation system and a 3dB optical beam splitter; the light beam in one path passes through a first polarization rotator and a phase generator sequentially, and a phase generator control module connected with the phase generator applies a control program to the phase generator so as to complete pure-phase encryption of whole optical information; the light beam in the other path passes through a second polarization rotator, a phase recovery generator and a third polarization rotator; the light beam encrypted through the phase generator and the light beam transmitted by the third polarization rotator are combined on an optical beam combiner; the combined light beam enters a photoelectric detection module through a polarizer; the photoelectric detection module converts optical signals into electric signals which are sent to the phase recovery control module by means of servo, and the phase recovery control module realizes recovery of required wavefront information on the basis of certain evaluation functions and optimization algorithms. The pure phase based optical encryption-decryption system has the advantages of high safety, quickness and convenience in information encryption and decryption.

Description

technical field [0001] The invention belongs to the field of optical information processing and relates to a phase-only optical encryption-decryption system. Background technique [0002] With the rapid development of computer network technology, the issue of information security has become an important issue, which has attracted extensive attention from researchers at home and abroad. Compared with the traditional information security technology based on electronic means, the optical information security technology has the advantages of large information capacity and high-speed parallelism. In addition, since light itself has multiple information such as amplitude, frequency, phase, and polarization, the use of optical information for encryption-decryption itself has the potential for high security. At present, for the encryption-decryption of optical information, researchers at home and abroad have proposed a variety of information encryption-decryption methods, mainly in...

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Problems solved by technology

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a pure phase-based optical encryption-decryption system to solve the inconvenience of recording and transmitting encoded information in the traditional information encryption-decryption method and the relative flexibility of the encryption-decryption system Poor and other deficiencies, realize the high security, speed and convenience of information encryption-decryption

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