Research On Optical Identity Authentication Technology Based On Phase-truncated Fourier Transform

With the application of information technology more and more widely,the security problems are also increasing,and the research of information security is facing increasingly severe challenges.As a new generation of information security technology,optical information security has many advantages over traditional information security technology based on Mathematics and computer,such as parallel data processing ability,multi-dimensional design freedom,large capacity key space,and so on.Therefore,it has become a research hotspot in the field of image encryption and authentication.The optical cryptosystem based on phase-truncated Fourier transform has recently attracted extensive attention of researchers.However,as an optical asymmetric encryption method,its security performance has also been questioned.At the same time,optical authentication technology,as an important part of optical information security,can be used to judge whether the message has been edited or not,as well as authentication and other aspects.Therefore,the research of optical authentication technology is not only helpful to the completeness of optical information security theory,but also has important practical significance.This paper first introduces the general situation of optical information security,then introduces the development status of symmetric cryptography,asymmetric cryptography and optical authentication step by step.At the same time,it briefly introduces the basic theory involved in this paper.By analyzing the optical asymmetric encryption technology of phase-truncated Fourier transform,the hidden security problems are deeply analyzed.From the point of view of security and practicability,an optical identity authentication system based on phase-truncated Fourier transform is proposed.The main purpose of this paper is to study optical authentication technology based on phase-truncated Fourier transform theory.The innovative work of this paper mainly includes the following two aspects:(1)The optical asymmetric cryptosystem based on phase-truncated Fourier transform is analyzed,and several typical attack schemes based on phase recovery algorithm are deeply studied.By combining the simulation results of MATLAB,the above schemes are compared and analyzed.On this basis,the fundamental causes of security vulnerabilities in optical cryptosystem based on phase-truncated Fourier transform and possible security enhancement schemes are discussed.(2)A secure and practical optical identity authentication system based on phase-truncated Fourier transform is designed.On the basis of phase-truncated Fourier transform optical path,spiral phase plate is introduced to participate in the design process of phase key and phase lock of authentication system.At the same time,multi-user and multi-level optical identity authentication is realized by combining key overlay and multiplexing technology,binary sparse technology and non-linear correlation algorithm.