Double-image encryption scheme combining DWT-based compressive sensing with discrete fractional random transform.

A new discrete fractional random transform based on two circular matrices is designed and a novel double-image encryption–compression scheme is proposed by combining compressive sensing with discrete fractional random transform. The two random circular matrices and the measurement matrix utilized in compressive sensing are constructed by using a two-dimensional sine Logistic modulation map. Two original images can be compressed, encrypted with compressive sensing and connected into one image. The resulting image is re-encrypted by Arnold transform and the discrete fractional random transform. Simulation results and security analysis demonstrate the validity and security of the scheme. [ABSTRACT FROM AUTHOR]