15 October 2012 Two-factor authentication system based on optical interference and one-way hash function
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We present a two-factor authentication method to verify the personal identification who tries to access an optoelectronic system. This method is based on the optical interference principle and the traditional one-way Hash function (e.g. MD5). The authentication process is straightforward, the phase key and the password-controlled phase lock of one user are loading on two Spatial Light Modulators (SLMs) in advance, by which two coherent beams are modulated and then interference with each other at the output plane leading to an output image. By comparing the output image with all the standard certification images in the database, the system can thus verify the user’s identity. However, the system designing process involves an iterative Modified Phase Retrieval Algorithm (MPRA). For an uthorized user, a phase lock is first created based on a “Digital Fingerprint (DF)”, which is the result of a Hash function on a preselected user password. The corresponding phase key can then be determined by use of the phase lock and a designated standard certification image. Note that the encode/design process can only be realized by digital means while the authentication process could be achieved digitally or optically. Computer simulations were also given to validate the proposed approach.
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Wenqi He, Wenqi He, Xiang Peng, Xiang Peng, Xiangfeng Meng, Xiangfeng Meng, Xiaoli Liu, Xiaoli Liu, } "Two-factor authentication system based on optical interference and one-way hash function", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 849909 (15 October 2012); doi: 10.1117/12.928458; https://doi.org/10.1117/12.928458

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