标题：Universal and special keys based on phase-truncated Fourier transform
作者：Qin, Wan; Peng, Xiang; Meng, Xiangfeng; Gao, Bruce
作者机构：[Qin, Wan; Peng, Xiang] Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ, Shenzhen 518060, Peoples R China.; [Qin, 更多
通讯作者地址：[Qin, W]Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ, Shenzhen 518060, Peoples R China.
关键词：phase-truncated Fourier transform; optical encoding; asymmetric; encryption
摘要：We propose a novel optical asymmetric cryptosystem based on a phase-truncated Fourier transform. Two decryption keys independent of each other are generated. They are referred to as universal key and special key, respectively. Each of them can be used for decryption independently in absence of the other. The universal key is applicable to decrypt any ciphertext encoded by the same encryption key, but with poor legibility. On the contrary, the special key is adequate for legible decryption, but only valid for one ciphertext corresponding to the specified plaintext. A set of simulation results show the interesting performance of two types of decryption keys. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3607421]