Noise-free recovery of optodigital encrypted and multiplexed images

Abstract

We present a method that allows storing multiple encrypted data using digital holography and a joint transform correlator architecture with a controllable angle reference wave. In this method, the information is multiplexed by using a key and a different reference wave angle for each object. In the recovering process, the use of different reference wave angles prevents noise produced by the nonrecovered objects from being superimposed on the recovered object; moreover, the position of the recovered object in the exit plane can be fully controlled. We present the theoretical analysis and the experimental results that show the potential and applicability of the method.

Optical encryption and QR codes: Secure and noise-free information retrieval

“…2, we sequentially show (a) the input object, (b) the encrypted object, (c) the result of decrypting but using an invalid key, and (d) the correct recovered object observing the inherent speckle noise all over the image. Obviously, the speckle noise is unavoidable when employing optical encryption with DRPE under any architecture, domain, or protocol [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. …”

“…Optical encryption probed its robustness, applicability, potentiality, and flexibility. Diverse recording media were inspected trying to find better storing capabilities [6][7][8]. Either one or more input objects were analyzed developing what is called multiplexing alternatives [9][10][11][12].…”

Experimental multiplexing approach via code key rotations under a joint transform correlator scheme

“…Fortunately, in our proposal we are able to locate every single decrypted object in separate places avoiding superposition of the decoded object with the background noise [11]. We multiplex N encrypted objects locating them in N different places…”

Multiplexing of encrypted data using fractal masks

“…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.…”

“…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].…”