Open AccessOptical cryptosystem based on phase-truncated Fresnel diffraction and transport of intensity equation
Author(s) -
Chenggong Zhang,
Wenqi He,
Jiachen Wu,
Xiang Peng
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.008845
Subject(s) - cryptosystem , plaintext , phase retrieval , ciphertext , phase (matter) , optics , encryption , computer science , fresnel diffraction , fresnel number , algorithm , diffraction , cryptography , physics , mathematics , fourier transform , mathematical analysis , quantum mechanics , operating system
A novel optical cryptosystem based on phase-truncated Fresnel diffraction (PTFD) and transport of intensity equation (TIE) is proposed. By using the phase truncation technique, a phase-encoded plaintext could be encrypted into a real-valued noise-like intensity distribution by employing a random amplitude mask (RAM) and a random phase mask (RPM), which are regarded as two secret keys. For decryption, a generalized amplitude-phase retrieval (GAPR) algorithm combined with the TIE method are proposed to recover the plaintext with the help of two keys. Different from the current phase-truncated-based optical cryptosystems which need record the truncated phase as decryption keys, our scheme do not need the truncated phase because of the introducing of the TIE method. Moreover, the proposed scheme is expected to against existing attacks. A set of numerical simulation results show the feasibility and security of the proposed method.