Optical cryptosystem based on phase-truncated
Fresnel diffraction and transport of intensity
equation
Chenggong Zhang, Wenqi He, Jiachen Wu, and Xiang Peng*
College of Optoelectronics Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of
Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
*
xpeng@szu.edu.cn
Abstract: 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.
©2015 Optical Society of America
OCIS codes: (060.4785) Optical security and encryption; (070.0070) Fourier optics and signal
processing.
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Received 28 Jan 2015; revised 22 Mar 2015; accepted 23 Mar 2015; published 30 Mar 2015
6 Apr 2015 | Vol. 23, No. 7 | DOI:10.1364/OE.23.008845 | OPTICS EXPRESS 8845