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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
