Cryptanalysis of Optical Ciphers Integrating Double Random Phase Encoding With Permutation

Abstract

This paper presents the cryptanalysis of optical ciphers combining double random phase encoding with permutation techniques, and shows its vulnerability against plaintext attack regardless of the implementation order of the two procedures. The equivalent secret keys of both the combination fashions can be retrieved, instead of the recovery of random phase masks and permutation matrix. Numerical simulations are also given for validation.

Keywords

• Double random phase encoding
• optical ciphers
• image permutation
• cryptanalysis