Image encryption and the fractional Fourier transform
Bryan M. Hennelly, John T. Sheridan · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2003
A number of method have been recently proposed in the literature for the encryption of 2-D information using optical systems based on the fractional Fourier fransform, FRT.In this paper a brief review of the methods proposed to date is presented.A measure of the strength/robustness of the level of encryption of the various techniques is proposed and a comparison is carried out between the methods.Optical implementations are discussed.Robustness of system with respect to misalignment and blind decryption are also discussed.