Multiplexing encryption–decryption via lateral shifting of a random phase mask

Barrera, John Fredy; Henao, Rodrigo; Tebaldi, Myrian; Torroba, Roberto; Bolognini, Néstor

doi:10.1016/j.optcom.2005.09.027

Cited by 88 publications

(40 citation statements)

References 25 publications

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“…Optical encryption technologies have been extended through the emergence of various multiplexing schemes, including wavelength multiplexing (Situ and Zhang 2005), spatial shifting (Situ and Zhang 2006;Fredy Barrera et al 2006), low-correlation phase masks (Rueda et al 2011), modulated amplitude masks (Barrera et al 2006a), and polarization multiplexing (Barrera et al 2006b). …”

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Crosstalk analysis for multiple-image encryption and image-quality equalization technology

et al. 2015

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We report a crosstalk analysis method for multiple-image encryption, which focuses on the individual effects of different multiplexed images in the crosstalk noise. The different noise characteristics are analyzed using a simulation model for each image. Using the resulting crosstalk noise characteristics, we can explain the differences in the quality of multiplexed images that cannot be explained using conventional approaches. Furthermore, we describe a simple image-modulation method to compensate for differences in image quality. We then experimentally show that using the image-modulation technique, we can significantly reduce the variation in image quality within a set of images. This technique leads to improvements in the quality of the poorest images in the set.

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Crosstalk analysis for multiple-image encryption and image-quality equalization technology

et al. 2015

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“…In general, multiplexing means encoding two or more images into a single one by optical or numerical techniques [6][7][8][9][10][11]. The usual multiplexed package is synthesized by superimposing individual encrypted images together.…”

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“…In this movie, the sequence of encoded frames was multiplexed using theta modulation, and, after an appropriate filtering procedure, a virtual optics decryption procedure was applied to reverse the coding process. However, most of the reported proposals responding to the above mentioned demand present digital simulations to support the main ideas, and only a few provide true experimental evidence [9][10][11].…”

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Multiplexing of encrypted data using fractal masks

et al. 2012

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In this Letter, we present to the best of our knowledge a new all-optical technique for multiple-image encryption and multiplexing, based on fractal encrypting masks. The optical architecture is a joint transform correlator. The multiplexed encrypted data are stored in a photorefractive crystal. The fractal parameters of the key can be easily tuned to lead to a multiplexing operation without cross talk effects. Experimental results that support the potential of the method are presented.

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“…An experimental version of this setup was implemented by using photorefractive crystals as storing media. During the decryption procedure, the phase-conjugated beams of the encrypted data allow to obtain the input image [3][4][5]. Several variations of the (DRPE) were proposed in the literature, for instance working in the fractional Fourier domain [6] and by using digital holography [7], to name a few.…”

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“…In Ref. [4][5]11] multiplexing based on shifting the random phase mask, the use of multiple apertures and the change in the polarization state or the wavelength are proposed. In the present work, we present a modified version of the conventional JTC scheme.…”

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Experimental encryption multiplexing based on a JTC scheme

Tebaldi

Vargas

Bolognini

et al. 2010

Photon. Lett. Poland

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Abstract-We present an alternative scheme to perform a multiple encrypting technique based on the use of a Joint Transform Correlator architecture. The basic approach relies on using an extra random phase mask placed before the correlator input plane, where we select different disjoint regions to encode each input object. In this way we avoid the cross talking when reconstructing the encoded objects. We experimentally validated the procedure using a photorefractive crystal as a storing medium.Encryption techniques are of great importance for data protection [1,2]. In particular, the development of optical encryption attracted increasing interest for its high processing speed and high security level. Conventional optical image-encryption methods are based on the 4-f correlator architecture that uses two random phase masks [1]. This scheme is known as Double Random Phase Encryption (DRPE). An experimental version of this setup was implemented by using photorefractive crystals as storing media. During the decryption procedure, the phase-conjugated beams of the encrypted data allow to obtain the input image [3][4][5]. Several variations of the (DRPE) were proposed in the literature, for instance working in the fractional Fourier domain [6] and by using digital holography [7], to name a few. Encryption techniques imply that the input image should not be recovered without employing the correct encoding key. It should be pointed out that the key code should not be inferred by hackers or unauthorized users. However, it was shown that encryption schemes present some weaknesses. In DRPE hackers demonstrated that they can access random phase keys in both the input plane and the Fourier plane. Chosen and known plaintext attacks [8,9] were employed to efficiently obtain the encoding keys of the system. The mentioned 4f scheme involves the generation of a phase conjugated beam to recover the input image. This holographic scheme requires precise alignment to be experimentally implemented. An alternative encryption technique based on JTC architecture (see Ref.[10]) introduces, in the input plane, both the object to be * E-mail: myrianc@ciop.unlp.edu.ar codified and the key code mask. In the decryption step, after an inverse FT of the joint power spectrum (JPS), which is illuminated by the FT of the exact key code mask, the input image is correctly recovered. This scheme can be also experimentally implemented by using a volume photorefractive intensity-sensitive crystal as storing media. Note that the JTC architecture is an inherent two step holographic set-up, avoiding the use of complex conjugate waves. It was also demonstrated the validity of algorithms for cracking the JTC encryption systems. However, multiplexing turns the system immune to the mentioned attacks, increasing therefore the encryption method security. Multiplexing techniques are based on encoding two or more input images and combining them into a single recording medium. Then, an intruder, who intercepts the encrypted multiplexed data, could not determine by si...

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Multiplexing encryption–decryption via lateral shifting of a random phase mask

Cited by 88 publications

References 25 publications

Crosstalk analysis for multiple-image encryption and image-quality equalization technology

Crosstalk analysis for multiple-image encryption and image-quality equalization technology

Multiplexing of encrypted data using fractal masks

Experimental encryption multiplexing based on a JTC scheme

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