Hierarchical image encryption based on cascaded iterative phase retrieval algorithm in the Fresnel domain

A novel hierarchical image encryption system based on cascaded multiple-phase retrieval by an iterative Fresnel-transform algorithm is proposed. In this method a series of phase masks cascaded in free space is employed to retrieve different target hidden images in their corresponding hierarchical levels. It can realize different levels of accessibility to the secret data for different authority levels with the same system, and the higher level authority can get access to more hidden images. This approach can achieve fast convergence and high quality of the recovered images without any recognizable cross-talk noise or distortion, and the security level of this system is further enhanced by the use of a series of supplemental keys such as the orders of cascaded phase masks and the geometrical parameters in addition to all the iterated phase masks as principal keys. The feasibility of this method and its unique features are verified and analysed by computer simulations.

[1]  Bahram Javidi,et al.  Secure optical data storage with random phase key codes by use of a configuration of a joint transform correlator. , 2003, Applied optics.

[2]  J R Fienup,et al.  Phase retrieval algorithms: a comparison. , 1982, Applied optics.

[3]  Y Li,et al.  Security and encryption optical systems based on a correlator with significant output images. , 2000, Applied optics.

[4]  B. Javidi,et al.  Encrypting three-dimensional information with digital holography. , 2000, Applied optics.

[5]  Yan Zhang,et al.  Optical encryption and verification technique for information coding in multiple-wavelengths in Fresnel domain , 2006 .

[6]  Qing Liu,et al.  Digital image encryption and watermarking by phase-shifting interferometry. , 2004, Applied optics.

[7]  Hsuan T. Chang,et al.  Design of cascaded phase keys for a hierarchical security system , 2002 .

[8]  G. Unnikrishnan,et al.  Optical encryption by double-random phase encoding in the fractional Fourier domain. , 2000, Optics letters.

[9]  Jingjuan Zhang,et al.  A cascaded iterative Fourier transform algorithm for optical security applications , 2003 .

[10]  Jingjuan Zhang,et al.  Image hiding with computer-generated phase codes for optical authentication , 2005 .

[11]  Hsuan T Chang,et al.  Multiple-phase retrieval for optical security systems by use of random-phase encoding. , 2002, Applied optics.

[12]  Bahram Javidi,et al.  Information hiding technique with double phase encoding. , 2002, Applied optics.

[13]  Chris Chatwin,et al.  Random phase encoding for optical security , 1996 .

[14]  Xian-Feng Xu,et al.  Digital color image watermarking based on phase-shifting interferometry and neighboring pixel value subtraction algorithm in the discrete-cosine-transform domain. , 2007, Applied optics.

[15]  X. F. Meng,et al.  Image watermarking based on an iterative phase retrieval algorithm and sine–cosine modulation in the discrete-cosine-transform domain , 2007 .

[16]  B Javidi,et al.  Encrypted optical memory system using three-dimensional keys in the Fresnel domain. , 1999, Optics letters.

[17]  Lu-Zhong Cai,et al.  Information security system by iterative multiple-phase retrieval and pixel random permutation. , 2006, Applied optics.

[18]  Yeon H. Lee,et al.  Encryption of digital hologram of 3-D object by virtual optics. , 2004, Optics express.

[19]  J Rosen.  Learning in correlators based on projections onto constraint sets. , 1993, Optics letters.

[20]  Joseph Rosen,et al.  Performance comparison of iterative algorithms for generating digital correlation holograms used in optical security systems. , 2006, Applied optics.

[21]  Xiangfeng Meng,et al.  Cross-talk-free double-image encryption and watermarking with amplitude–phase separate modulations , 2005 .

[22]  B Javidi,et al.  Optical image encryption based on input plane and Fourier plane random encoding. , 1995, Optics letters.

[23]  Bahram Javidi,et al.  Optical and Digital Techniques for Information Security , 2004 .

[24]  Jingjuan Zhang,et al.  Optical image hiding in the Fresnel domain , 2006 .

[25]  John T. Sheridan,et al.  Optical image encryption by random shifting in fractional Fourier domains. , 2003, Optics letters.