Experimental scrambling and noise reduction applied to the optical encryption of QR codes.

In this contribution, we implement two techniques to reinforce optical encryption, which we restrict in particular to the QR codes, but could be applied in a general encoding situation. To our knowledge, we present the first experimental-positional optical scrambling merged with an optical encryption procedure. The inclusion of an experimental scrambling technique in an optical encryption protocol, in particular dealing with a QR code "container", adds more protection to the encoding proposal. Additionally, a nonlinear normalization technique is applied to reduce the noise over the recovered images besides increasing the security against attacks. The opto-digital techniques employ an interferometric arrangement and a joint transform correlator encrypting architecture. The experimental results demonstrate the capability of the methods to accomplish the task.

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

[2]  Ayman Alfalou,et al.  New spectral image compression method based on an optimal phase coding and the RMS duration principle , 2010 .

[3]  Roberto Torroba,et al.  Experimental QR code optical encryption: noise-free data recovering. , 2014, Optics letters.

[4]  Bahram Javidi,et al.  Polarization encoding for optical security systems , 2000 .

[5]  Roberto Torroba,et al.  Optical encryption and QR codes: secure and noise-free information retrieval. , 2013, Optics express.

[6]  John T. Sheridan,et al.  Optical encryption by combining image scrambling techniques in fractional Fourier domains , 2013 .

[7]  Ayman Alfalou,et al.  Optical image compression and encryption methods , 2009 .

[8]  Guofan Jin,et al.  Secure and noise-free holographic encryption with a quick-response code , 2014 .

[9]  Oliver Graydon.  Cryptography: Quick response codes , 2013 .

[10]  María S. Millán,et al.  Improved decryption quality and security of a joint transform correlator-based encryption system , 2013 .

[11]  Bahram Javidi,et al.  Optical encryption using a joint transform correlator architecture , 2000 .

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

[13]  马建设,et al.  Secure and noise-free holographic encryption with a quick-response code , 2014 .

[14]  Naveen K. Nishchal,et al.  Flexible optical encryption with multiple users and multiple security levels , 2011 .

[15]  Myrian Tebaldi,et al.  Experimental opto-digital synthesis of encrypted sub-samples of an image to improve its decoded quality , 2011 .

[16]  G Unnikrishnan,et al.  Optical encryption system that uses phase conjugation in a photorefractive crystal. , 1998, Applied optics.