Cryptanalysis of an image encryption scheme based on joint transform correlator with amplitude- and phase- truncation approach

In this paper, a novel optical cryptosystem is proposed that uses amplitude- and phase-truncation approach in joint transform correlator (JTC) architecture. Due to amplitude- and phase- truncation, the encryption scheme becomes asymmetric and cryptanalysis of the scheme reveals that it is resistant to hybrid attack. This hybrid attack is the combination of specific attack on asymmetric cryptosystem and chosen-plaintext attack on JTC. We also carry out authentication verification using this correlation geometry. The scheme can be implemented digitally or optically employing a conventional JTC. Computer simulation results validate the proposed method.