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An overview of visual cryptography
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TLDR
An overview of the emerging Visual Cryptography (VC), a new technique which provides information security which uses simple algorithm unlike the complex, computationally intensive algorithms used in other techniques like traditional cryptography.Abstract:
Security has become an inseparable issue as information technology is ruling the world now. Cryptography is the study of mathematical techniques related aspects of Information Security such as confidentiality, data security, entity authentication and data origin authentication, but it is not the only means of providing information security, rather one of the techniques. Visual cryptography is a new technique which provides information security which uses simple algorithm unlike the complex, computationally intensive algorithms used in other techniques like traditional cryptography. This technique allows Visual information (pictures, text, etc) to be encrypted in such a way that their decryption can be performed by the human visual system, without any complex cryptographic algorithms. This technique encrypts a secret image into shares such that stacking a sufficient number of shares reveals the secret image. Shares are usually presented in transparencies. In this paper we provide an overview of the emerging Visual Cryptography (VC) and related security research work done in this area.read more
Citations
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TL;DR: The project presents an approach for encrypting visual cryptographically generated image shares using Public Key Encryption, which provides more secure secret shares that are robust against a number of attacks & the system provides a strong security for the handwritten text, images and printed documents over the public network.
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TL;DR: A secure electronic voting system that provides enhanced security by implementing cryptography and steganography in Java is proposed.
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Extended visual cryptography for color images using coding tables
TL;DR: This paper proposes a new VC scheme for color images that makes use of Jarvis error filter, a key table and specialized tables for coding, thereby reducing the suspicion of data encryption.
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A Visual Cryptographic Encryption Technique for Securing Medical Images
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References
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Visual Cryptography
Moni Naor,Adi Shamir +1 more
TL;DR: In this paper, a new type of cryptographic scheme, which can decode concealed images without any cryptographic computations, is proposed, which is called k-out-of-n secret sharing.
Journal ArticleDOI
Visual cryptography for gray-level images by dithering techniques
Chang-Chou Lin,Wen-Hsiang Tsai +1 more
TL;DR: A (k, n)-threshold visual cryptography scheme is proposed to encode a secret image into n shadow images, where any k or more of them can visually recover the secret image, but any k - 1 or fewer of them gain no information about it.
Proceedings Article
Extended visual cryptography for natural images
TL;DR: This paper presents a system which takes three pictures as an input and generates two images which correspond to two of the three input pictures, which are reconstructed by printing the two output images onto transparencies and stacking them together.
Journal ArticleDOI
Cheating Prevention in Visual Cryptography
Chih-Ming Hu,Wen-Guey Tzeng +1 more
TL;DR: A generic method that converts a VCS to another VCS that has the property of cheating prevention is proposed and the overhead of the conversion is near optimal in both contrast degression and pixel expansion.
Journal ArticleDOI
Progressive color visual cryptography
TL;DR: A novel technique is developed that enables visual cryptography of color as well as gray-scale images with a unique flexibility that enables a single encryption of a color image but enables three types of decryptions on the same ciphertext.