A multiple-image encryption scheme based on cascaded fractional Fourier transform is proposed. In the scheme, images are successively coded into the amplitude and phase of the input by cascading stages, which ends up with an encrypted image and a series of keys. The scheme takes full advantage of multikeys and the cascaded relationships of all stages, and it not only realizes image encryption but also achieves higher safety and more diverse applications. So multiuser authentication and hierarchical encryption are achieved. Numerical simulation verifies the feasibility of the method and demonstrates the security of the scheme and decryption characteristics. Finally, flexibility and variability of the scheme in application are discussed, and the simple photoelectric mixed devices to realize the scheme are proposed.
© 2013 Optical Society of America
Fourier Optics and Signal Processing
Original Manuscript: December 3, 2012
Revised Manuscript: January 29, 2013
Manuscript Accepted: March 18, 2013
Published: April 15, 2013
Dezhao Kong, Xueju Shen, Qinzu Xu, Wang Xin, and Haiqiong Guo, "Multiple-image encryption scheme based on cascaded fractional Fourier transform," Appl. Opt. 52, 2619-2625 (2013)