Abstract

We used for the first time the speckle pattern created by the scattered laser beam from rough surfaces in order to perform the visual secret sharing, which is alternative material for random grid pattern. Segmentation and binarization of the speckle pattern was performed for making one share embedding secret image. Reconstruction of the secret image was successfully achieved by the product between the share and the original speckle pattern.

Highlights

  • The visual secret sharing or the visual cryptography was first proposed by Naor and Shamir(1)

  • We propose to use the speckle pattern that was created by the laser scattering with random media as a random grid

  • The proposed method can recover the secret image when illuminating the share by the laser speckle pattern same as the encryption process

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Summary

Introduction

The visual secret sharing or the visual cryptography was first proposed by Naor and Shamir(1). In 1987, Kafri and Keren first used the random grid for encryption of the secret (2) They used the random grid that consists of randomly distributed black and white pixels as a first share and generated the second share by calculation between the random grid and the secret image. They needed no pixel expansion in the encryption process. The proposed method can recover the secret image when illuminating the share by the laser speckle pattern same as the encryption process. It means that the proposed method does not need any transparent object

Theoretical background
Speckle pattern
Formation of speckle pattern
Experimental
Results
Full Text
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