Results 261 to 270 of about 52,493 (283)

A Cheat-Prevention Visual Secret Sharing Scheme with Minimum Pixel Expansion

2014
A visual secret sharing (VSS) scheme with minimum pixel expansion is proposed to prevent malicious participants from deceiving an honest participant. A VSS scheme encrypts a secret image into pieces referred to as shares where each participant keeps a share so that stacking sufficient number of shares recovers the secret image.
Shenchuan Liu, Masaaki Fujiyoshi, Hitoshi Kiya   +2 more
openaire   +1 more source

A cheat preventing method with efficient pixel expansion for Naor-Shamir's visual cryptography

2014 IEEE International Conference on Image Processing (ICIP), 2014
This paper proposes a cheat-prevention method of visual cryptography (VC) for binary images. A VC technique encrypts a secret image into images referred to as shares so that stacking sufficient shares recovers the secret image, where shares are kept by different parties. The proposed method prevents malicious parties from deceiving an honest party, i.e.
Shenchuan Liu, Masaaki Fujiyoshi, Hitoshi Kiya   +2 more
openaire   +1 more source

Secure telemedicine using RONI halftoned visual cryptography without pixel expansion

Journal of Information Security and Applications, 2019
Abstract To provide quality healthcare services worldwide telemedicine is a well-known technique. It delivers healthcare services remotely. For the diagnosis of disease and prescription by the doctor, lots of information is needed to be shared over public and private channels. Medical information like MRI, X-Ray, CT-scan etc.
Arvind Bakshi, Anoop Kumar Patel
openaire   +1 more source

Visual secret sharing scheme: prioritizing the secret pixels with different pixel expansions to enhance the image contrast

Optical Engineering, 2007
A visual secret sharing (VSS) scheme is a secret image sharing scheme that divides a secret pixel into several subpixels (the number of subpixels is called the pixel expansion). The secret image encrypted by the VSS technique can be visually revealed without additional computations.
openaire   +1 more source

Aspect ratio invariant visual secret sharing schemes with minimum pixel expansion

Pattern Recognition Letters, 2005
Visual secret sharing (VSS) scheme is a perfect secure method to hide a secret image by breaking it into shadow images and one can decode it easily by the human visual system. We use m, the pixel expansion, subpixels to represent a pixel. Suppose the secret image is a circle and m is not a square value, i.e., the aspect ratio is changed.
Ching-Nung Yang, Tse-Shih Chen
openaire   +1 more source

An Improved Reversible Watermarking Based on Pixel Value Ordering and Prediction Error Expansion

2020
In this paper, a new pixel value ordering (PVO) and prediction error Expansion (PEE) based reversible watermarking method is proposed. PVO based method firstly introduced by Li et al.’s has been concerned and expanded because it can achieve high embedding capacity without losing the implication of the cover.
Le Quang Hoa, Cao Thi Luyen, Nguyen Kim Sao, Pham Van At   +3 more
openaire   +1 more source

Cheating Immune Visual Cryptographic Scheme with Reduced Pixel Expansion

2018
One of the drawbacks in visual cryptography is cheating attacks, where the malicious adversaries can cheat the honest participant by submitting fake shares during reconstruction phase. Cheating immune visual cryptographic schemes are used for mitigating cheating attacks in visual cryptography.
Kanakkath Praveen, M. Sethumadhavan
openaire   +1 more source

An Improved Aspect Ratio Invariant Visual Cryptography Scheme with Flexible Pixel Expansion

2016
In traditional visual cryptography scheme (VCS), each pixel of secret image is encrypted into m(\( \geqslant 1 \)) subpixels in the share images. Unfortunately, recovered image will be distorted when the pixel expansion is not a square number. In order to reveal the information of the secret image faithfully, aspect ratio of the recovered image should ...
Wen Wang 0008, Feng Liu 0001, WeiQi Yan 0001, Gang Shen, Teng Guo 0005   +4 more
openaire   +1 more source

Optical information hiding system with pixel-free expansion visual cryptography

Journal of Optics
Abstract We propose an optical information hiding system with pixel-free expansion visual cryptography (PEVC). In the optical concealment process, initially, a PEVC scheme is utilized to encode the secret image. This approach generates visual keys of the same size as the secret image, addressing the pixel expansion issue inherent in ...
Ruize Liu, Chengzhe Wu, Changjun Ke, Yishi Shi   +3 more
openaire   +1 more source

Recursive Visual Cryptography Using Random Basis Column Pixel Expansion

10th International Conference on Information Technology (ICIT 2007), 2007
Thomas Monoth, Babu Anto P.
openaire   +1 more source