Asymmetric cryptosystem using coherent superposition and equal modulus decomposition of fractional Fourier spectrum

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• 作者：Sonam Palden Barfungpa ; Muhammad Rafiq Abuturab
• 关键词：Asymmetric cryptosystem ; Equal modulus decomposition ; Fractional Fourier transform
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：48
• 期：11
• 全文大小：4,745 KB
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X
• 卷排序：48

文摘

A new asymmetric cryptosystem based on coherent superposition and equal modulus decomposition of fractional Fourier spectrum is proposed. In this method, each channel of the color image is normalized, modulated by random phase function, and subsequently fractional Fourier transformed. The transformed image is divided into two masks with equal moduli. The two masks are independently fractional Fourier transformed and then phase- and amplitude truncated to get corresponding encrypted images and decryption (/private) keys. The fractional orders and decryption keys strengthen the security of the proposed structure significantly. The proposed system can resist known-plaintext and known-public key attacks (specific attack). The encryption process is realized digitally while the decryption can be implemented optically or digitally. A set of simulation results shows the validity of proposed cryptosystem.