Cryptanalysis of an "asymmetric optical cryptosystem based on coherent superposition and equal modulus decomposition"

Jingjing Wu; Wei Liu; Zhengjun Liu; Shutian Liu

doi:10.1364/AO.54.008921

Cryptanalysis of an "asymmetric optical cryptosystem based on coherent superposition and equal modulus decomposition"

Appl Opt. 2015 Oct 20;54(30):8921-4. doi: 10.1364/AO.54.008921.

Authors

Jingjing Wu, Wei Liu, Zhengjun Liu, Shutian Liu

PMID: 26560380
DOI: 10.1364/AO.54.008921

Abstract

We analyze and present an attack scheme of the asymmetric optical cryptosystem proposed recently based on coherent superposition and equal modulus decomposition [Opt. Lett.40, 475 (2015)OPLEDP0146-959210.1364/OL.40.000475]. We prove that the attacker can recover the original image with the ciphertext and public keys through the amplitude-phase retrieval algorithm by using two constraints. One constraint of the amplitude-phase retrieval algorithm is the public key and the other is obtained through the analysis of the cryptosystem. The simulation results demonstrate the feasibility of the attack method.