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18 November 2009 Collision in double-phase encryption based on fractional Fourier transform
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Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 751205 (2009) https://doi.org/10.1117/12.837579
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China
Abstract
Collision is a situation that occurs when two or more distinct inputs into a security system produce identical outputs, which is undesirable in security applications such as watermarking and authentication. In this report we present a study of the collision property of double random-phase encoding (DRPE) in the fractional Fourier (FRT) domain. For a decade, optical security systems operating in the FRT domain is said to have a larger key space and therefore higher security. However we find that it is still possible to produce meaningful collision from the cyphertext or a watermarking embedded in a host image even without any knowledge about the fractional orders or the random phase keys.
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Guohai Situ, Giancarlo Pedrini, and Wolfgang Osten "Collision in double-phase encryption based on fractional Fourier transform", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 751205 (18 November 2009); https://doi.org/10.1117/12.837579
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