Abstract A new distribution scheme of decryption keys used in optical verification systems is proposed. The encryption procedure is digitally implemented with the use of an iteration algorithm in computer. Three target images corresponding to three wavelengths are encoded into three sets of phase-only masks (POMs) by a special distributing method. These three sets of POMs are assigned to three authorized users as the personal identification. A lensless optical system is used as the verification system. In the verification procedure, every two of the three authorized users can pass the verification procedure cooperatively, but only one user cannot do. Numerical simulation shows that the proposed distribution scheme of decryption keys not only can improve the security level of verification system, but also can bring convenience and flexibility for authorized users.
Received: 31 May 2005
Revised: 16 June 2005
Accepted manuscript online:
(Telecommunications: signal transmission and processing; communication satellites)
Cite this article:
Niu Chun-Hui (牛春晖), Zhang Yan (张岩), Gu Ben-Yuan (顾本源) A new distribution scheme of decryption keys used in optical verification system with multiple-wavelength information 2005 Chinese Physics 14 1996
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