| A new distribution scheme of decryption keys used in optical verification system with multiple-wavelength information |
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| 作者姓名： | 牛春晖 张岩 顾本源 |
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| 作者单位： | Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;Department of Physics,Capital Normal University, Beijing 100037, China;Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 摘 要： | 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.
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| 关 键 词： | 光学系统 光学编码 多波长信息 衍射现象 反复算法 |
| 收稿时间： | 2005-05-31 |
| 修稿时间： | 2005-05-312005-06-16 |
A new distribution scheme of decryption keys used in optical verification system with multiple-wavelength information |
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| Niu Chun-Hui,Zhang Yan and Gu Ben-Yuan.A new distribution scheme of decryption keys used in optical verification system with multiple-wavelength information[J].Chinese Physics B,2005,14(10):1996-2003. |
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| Authors: | Niu Chun-Hui Zhang Yan and Gu Ben-Yuan |
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| Institution: | Department of Physics,Capital Normal University, Beijing 100037, China; Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 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. |
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| Keywords: | optical encryption technique multiple-wavelength information diffractive optical system |
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