title: Universal and special keys based on phase-truncated Fourier transform.
abstract: 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 de cryption keys.
authors.affiliation: Shenzhen University, College of Optoelectronics Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen 518060, China ; Clemson University, Department of Bioengineering, Clemson, South Carolina 29634.
authors.forename: Wan
authors.initials: W
authors.lastname: Qin
authors.affiliation: Shenzhen University, College of Optoelectronics Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen 518060, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Peng
authors.affiliation: Shandong University, School of Information Science and Engineering, Jinan 250100, China tylgqinwan@163.com.
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Meng
authors.affiliation: Clemson University, Department of Bioengineering, Clemson, South Carolina 29634.
authors.forename: Bruce
authors.initials: B
authors.lastname: Gao
keywords: asymmetric encryption; optical encoding; phase-truncated Fourier transform