Journal
OPTICS COMMUNICATIONS
Volume 376, Issue -, Pages 47-51Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2016.05.016
Keywords
Multi-parameter fractional Fourier transform; Image encryption; Information security
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Recently, multi-parameter fractional Fourier transform (MPFRFT) has been widely applied in the optics cryptosystem, which has attracted more and more researchers' attention. However, in further study we find a serious security problem on the MPFRFT which is the multi-choice of decryption key corresponding to an encryption key. The existence of multi-decryption-key hinders the application of this algorithm. We present a new generalized fractional Fourier transform, which can overcome the problem and enlarge the key space. The simulation results show that the proposed algorithm has higher security and key sensitivity. (C) 2016 Elsevier B.V. All rights reserved.
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