The core objective of secret sharing concentrates on developing a novel technique that prevents the destruction and leakage of original data during the distribution and encoding processes. Progressive Visual Cryptography (VC) is considered for the potential over the traditional VC schemes since the former does not require and does not suffer from the limitations of requiring a minimum number of participants during the process of encryption and sharing. The chaotic map-based Progressive VC is superior in facilitating predominant secrecy under sharing and encryption. In this paper, an Improved Henon Chaotic Map-based Progressive Block-based VC (IHCMPBVC) scheme is proposed to prevent the leakage and destruction of sensitive information during an exchange and encryption. This proposed IHCMPBVC technique uses the merits of Henon and Lorentz maps for effective encryption since it introduces the option of deriving non-linear behavior that results in sequence generation that covers the complete range with proper distribution in order to minimize the degree of leaks in sharing. The simulation results of the proposed IHCMPBVC technique investigated using entropy, PSNR, and Mean Square Error were improved at an average rate of 27%, 23%, and 31%, predominant to the baseline VC approaches considered in the comparison. 

Improved Henon Chaotic Map-based Progressive Block-based visual cryptography strategy for securing sensitive data in a cloud EHR system

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.

/pdf/visual-secret-sharing-by-speckle-pattern-illumination-c8wlvwr369.pdf

Visual Secret Sharing by Speckle Pattern Illumination

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 (visual cryptography), 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.

/pdf/visual-cryptography-by-speckle-pattern-illumination-1kvpqe4tt1.pdf

Visual Cryptography by Speckle Pattern Illumination

Novel technique for image encryption, which is based on a phase decomposition of the optical wave, and for decryption with an interferometry, was proposed. The phase decomposition was successfully performed by splitting pixel brightness into two vectors with random phases. The two encrypted images have constant amplitude and purely random phase, so that no one could see existence of the image. The hidden image could be recovered by superposing and interfering with the two encrypted images. The decrypted image was exactly the same as the original one with no noise. Our technique is applicable not only to binary images but also to grayscale images. We confirmed our technique by the computer simulation.

/pdf/image-encryption-based-on-phase-decomposition-technique-1e3i8dwumu.pdf

Hoang Hoa Tien Dung

Papers

Visual Secret Sharing by Speckle Pattern Illumination

Visual Cryptography by Speckle Pattern Illumination

Image Encryption Based on Phase Decomposition Technique