scholarly journals An investigation of visual cryptography and its applications in secure communications

2017 ◽  
Author(s):  
Elham Shahab ◽  
Hadi Abdolrahimpour
Keyword(s):  
Visual System ◽  
Secret Sharing ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Input Image ◽  
Secure Communications ◽  
Security Issues ◽  
Main Input ◽  
To Receive ◽  
Distinguishing Features

Secret sharing approach and in particular Visual Cryptography (VC) try to address the security issues in dealing with images. In fact, VC is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography. VC takes an image (secret) as an input and encrypts (divide) into two or more pieces (shares) that each of them can not reveal any information about the main input. The decryption way in this scenario is done through superimposing shares on top of each other to receive the input image. No computer participation is required, thus showing one of the distinguishing features of VC. It is claimed that VC is a unique technique in the sense that the encrypted message can be decrypted directly by the human visual system.

scholarly journals An investigation of visual cryptography and its applications in secure communications

2017 ◽  
Author(s):  
Elham Shahab ◽  
Hadi Abdolrahimpour
Keyword(s):  
Visual System ◽  
Secret Sharing ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Input Image ◽  
Secure Communications ◽  
Security Issues ◽  
Main Input ◽  
To Receive ◽  
Distinguishing Features

Secret sharing approach and in particular Visual Cryptography (VC) try to address the security issues in dealing with images. In fact, VC is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography. VC takes an image (secret) as an input and encrypts (divide) into two or more pieces (shares) that each of them can not reveal any information about the main input. The decryption way in this scenario is done through superimposing shares on top of each other to receive the input image. No computer participation is required, thus showing one of the distinguishing features of VC. It is claimed that VC is a unique technique in the sense that the encrypted message can be decrypted directly by the human visual system.

scholarly journals A comprehensive investigation of visual cryptography and its role in secure communications

2017 ◽  
Author(s):  
Elham Shahab ◽  
Hadi Abdolrahimpour
Keyword(s):  
Secret Sharing ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Input Image ◽  
Secure Communications ◽  
Comprehensive Investigation ◽  
Security Issues ◽  
Main Input ◽  
To Receive ◽  
Distinguishing Features

Secret sharing approach and in particular Visual Cryptography (VC) try to address the security issues in dealing with images. In fact, VC is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography. VC takes an image (secret) as an input and encrypts (divide) into two or more pieces (shares) that each of them can not reveal any information about the main input. The decryption way in this scenario is done through superimposing shares on top of each other to receive the input image. No computer participation is required, thus showing one of the distinguishing features of VC. It is claimed that VC is a unique technique in the sense that the encrypted message can be decrypted directly by the human visual system.

scholarly journals A comprehensive investigation of visual cryptography and its role in secure communications

2017 ◽  
Author(s):  
Elham Shahab ◽  
Hadi Abdolrahimpour
Keyword(s):  
Secret Sharing ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Input Image ◽  
Secure Communications ◽  
Comprehensive Investigation ◽  
Security Issues ◽  
Main Input ◽  
To Receive ◽  
Distinguishing Features

Secret sharing approach and in particular Visual Cryptography (VC) try to address the security issues in dealing with images. In fact, VC is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography. VC takes an image (secret) as an input and encrypts (divide) into two or more pieces (shares) that each of them can not reveal any information about the main input. The decryption way in this scenario is done through superimposing shares on top of each other to receive the input image. No computer participation is required, thus showing one of the distinguishing features of VC. It is claimed that VC is a unique technique in the sense that the encrypted message can be decrypted directly by the human visual system.

A Study on Visual Cryptography for Colour Images

2017 ◽  
Vol 7 (7) ◽  
pp. 260
Author(s):  
R. Shanmuga Priya ◽  
A. Senthilkumar
Keyword(s):  
Image Processing ◽  
Computational Complexity ◽  
Secret Sharing ◽  
Human Visual System ◽  
Visual Information ◽  
Visual Cryptography ◽  
Pixel Expansion ◽  
Image Processing Techniques ◽  
Printed Text ◽  
Processing Techniques

The intent of this paper is to present some of the major things about visual cryptography for colour images. The idea behind this technique is quite simple and powerful. Visual cryptography deals with visual information like picture, printed text and written notes etc. Visual cryptography also called secret sharing. As the name implies visual cryptography which has a single secret image and more than one shadow images and provided for numerous users. Visual cryptography process depends on various measures such as accuracy, computational complexity, pixel expansion, contrast whether generated it is meaningless or meaningful. Encryption performed by image processing techniques and the decryption carried out by human visual system with the stacking images. Visual cryptography need not require any complicated cryptographic proficiency. So, the intruders or hackers get hard to hack the details programmatically. However, this papers deals with visual cryptography for colour images.

scholarly journals Visual Cryptography Scheme with Essential Participants

Mathematics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 838 ◽  
Author(s):  
Peng Li ◽  
Liping Yin ◽  
Jianfeng Ma
Keyword(s):  
Integer Programming ◽  
Visual System ◽  
Human Visual System ◽  
Programming Model ◽  
Visual Cryptography ◽  
Optimal Choice ◽  
Experimental Results ◽  
Secret Image ◽  
Visual Cryptography Scheme ◽  
Computational Resources

Visual cryptography scheme (VCS) shares a binary secret image into multiple shadows printed on transparencies. Stacking shadows can visually decode the secret image without computational resources. Specifically, a (k, n) threshold VCS ((k, n)-VCS) shares a secret image into n shadows, stacking any k shadows can reveal the secret image by human visual system, while any less than k shadows cannot decode any information regarding the secret image. In practice, some participants (essentials) play more important roles than others (non-essentials). In this paper, we propose a (t, s, k, n) VCS with essential participants (so called (t, s, k, n)-EVCS). The secret image is shared into n shadows with s essentials and n-s non-essentials. Any k shadows, including at least t essentials, can reveal the secret image. The proposed scheme is constructed from a monotonic (K, N)-VCS. The condition and optimal choice of (K, N)-VCS to construct (t, s, k, n)-EVCS are given by solving integer programming model. The experimental results are conducted to verify the feasibility of our scheme.

Exploiting the Homomorphic Property of Visual Cryptography

2017 ◽  
Vol 9 (2) ◽  
pp. 45-56 ◽  
Author(s):  
Xuehu Yan ◽  
Yuliang Lu ◽  
Lintao Liu ◽  
Song Wan ◽  
Wanmeng Ding ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Signal Processing ◽  
Theoretical Analysis ◽  
Visual System ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Secret Image ◽  
Simulation Results ◽  
Cryptographic Scheme

In this paper, homomorphic visual cryptographic scheme (HVCS) is proposed. The proposed HVCS inherits the good features of traditional VCS, such as, loss-tolerant (e.g., (k, n) threshold) and simply reconstructed method, where simply reconstructed method means that the decryption of the secret image is based on human visual system (HVS) without any cryptographic computation. In addition, the proposed HVCS can support signal processing in the encrypted domain (SPED), e.g., homomorphic operations and authentication, which can protect the user's privacy as well as improve the security in some applications, such as, cloud computing and so on. Both the theoretical analysis and simulation results demonstrate the effectiveness and security of the proposed HVCS.

scholarly journals Exploiting the Homomorphic Property of Visual Cryptography

Cryptography ◽  
2020 ◽  
pp. 416-427
Author(s):  
Xuehu Yan ◽  
Yuliang Lu ◽  
Lintao Liu ◽  
Song Wan ◽  
Wanmeng Ding ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Signal Processing ◽  
Theoretical Analysis ◽  
Visual System ◽  
Human Visual System ◽  
Visual Cryptography ◽  
Secret Image ◽  
Simulation Results ◽  
Cryptographic Scheme

In this paper, homomorphic visual cryptographic scheme (HVCS) is proposed. The proposed HVCS inherits the good features of traditional VCS, such as, loss-tolerant (e.g., (k, n) threshold) and simply reconstructed method, where simply reconstructed method means that the decryption of the secret image is based on human visual system (HVS) without any cryptographic computation. In addition, the proposed HVCS can support signal processing in the encrypted domain (SPED), e.g., homomorphic operations and authentication, which can protect the user's privacy as well as improve the security in some applications, such as, cloud computing and so on. Both the theoretical analysis and simulation results demonstrate the effectiveness and security of the proposed HVCS.

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