A lensless optical security system based on computer-generated phase only masks

A lensless optical security system based on computer generated phase only masks is proposed in the present paper. These masks are located at determined positions along the direction of propagation so as to decrypt the target image. These positions coordinates are used as encoding parameters as well as the wavelength in the encryption process. Compared with previous studies, the proposed system has three significant advantages: first, it is lensless and therefore can minimize the hardware requirement and is much easier to implement. Second, the proposed system uses the wavelength and the position parameters besides the phase codes as additional keys and consequently achieves much higher security. Finally, the encrypted data can be directly transmitted via communication lines and then decrypted with the correct wavelength and the position parameters at the receiver. Applications and implementation considerations of the proposed system are also discussed.

[1]  Yan Zhang,et al.  Optical encryption based on iterative fractional Fourier transform , 2002 .

[2]  B Javidi,et al.  Optoelectronic information encryption with phase-shifting interferometry. , 2000, Applied optics.

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

[4]  S Liu,et al.  Optical image encryption based on multifractional Fourier transforms. , 2000, Optics letters.

[5]  Stefan Sinzinger,et al.  Microoptically integrated correlators for security applications , 2002 .

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

[7]  Xiang Peng,et al.  Double-lock for image encryption with virtual optical wavelength. , 2002, Optics express.

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

[9]  B. Javidi,et al.  Encrypted optical storage with wavelength-key and random phase codes. , 1999, Applied optics.

[10]  P C Mogensen,et al.  Phase-only optical encryption. , 2000, Optics letters.

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

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

[13]  Yunlong Sheng,et al.  Optical implementation of image encryption using random phase encoding , 1996 .

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

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