visual cryptography-2





Secure iris authentication using visual cryptography

FREE-DOWNLOAD [PDF] from arxiv.orgPS Revenkar, A Anjum2010




Extended capabilities for visual cryptography
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An extended visual cryptography scheme (EVCS), for an access structure (Qual; Forb) on a set of n participants, is a technique to encode n images in such a way that when we stack together the transparencies associated to participants in any set X∈ Qual we get the secret

Visual cryptography for grey level images
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Visual cryptography is a cryptographic paradigm introduced by Naor and Shamir [Lecture participants can decode a secret message (a black and white image) without any knowledge

Survey of visual cryptography schemes
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Visual cryptography scheme is a cryptographic technique which allows visual information (eg printed text, handwritten notes, and picture) to be encrypted in such a way that the decryption can be performed by the human visual system, without the aid of computers

A digital image copyright protection scheme based on visual cryptography
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A simple and efficient watermark method is proposed in this paper. The watermark method is an excellent technique to protect the copyright ownership of a digital image. The proposed watermark method is built up on the concept of visual cryptography . According to the

Segment-based visual cryptography
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A version of Visual Cryptography is presented which is not pixel-based but segment-based. It is used to encrypt messages consisting of symbols which can be represented by a segment display. For example, the decimal digits 0,, 9 can be represented by the well

An application of visual cryptography to financial documents
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VCRYPT, an application of visual cryptography , is described as a means of transmitting financial documents where moderate security is required. Visual cryptography in general uses a simple algorithm unlike the complex, computationally intensive algorithms used in

A watermarking technique based on visual cryptography
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With the explosive growth of internet technology robust methods are being developed to protect the proprietary rights of the multimedia. This paper considers the problem of embedding a binary watermark in a gray-level image using the concept of Visual

Self watermarking based on visual cryptography
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We are proposing a simple watermarking method based on visual cryptography . The method is based on selection of specific pixels from the original image instead of random selection of pixels as per Hwang paper. Verification information is generated which will

An overview of visual cryptography
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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

A multiple watermarking technique for images based on visual cryptography
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With the explosive growth of internet technology robust methods are being developed to protect the proprietary rights of the multimedia. In this paper, an invisible watermarking technique is proposed, to embed multiple binary watermarks into digital images based on

Seeing and believing is a threat: A visual cryptography schemes
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A ESTRA ( T Visual cryptography is the latest means of cryptography modes that takes in the humans natural vision to decrypt the image without any tedious processes involved. lhis technique has the methods of setting information in a hap hazard manner which get Visual cryptography is a secret sharing technique which allows the encryption of a secret image among a number of participants. The beauty of visual cryptography scheme (VCS) is its decryption of the secret image requires neither cryptography knowledge nor complex

A visual cryptography based watermark technology for individual and group images
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The ease by which digital information can be duplicated and distributed has led to the need for effective copyright protection tools. Various techniques including watermarking have been introduced in attempt to address these growing concerns. Most watermarking

Visual Cryptography scheme for Secret image retrieval
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The (t, n) visual cryptography (VC) is a secret stacking of t-1 any out of transparencies reveals the sharing scheme where a secret image is encoded into transparencies, and the secret image. The stacking of or fewer transparencies is unable to extract any information

Threshold visual cryptography scheme for color images with no pixel expansion
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Since the introduction of threshold visual cryptography by Naor and Shamir, there have been many other schemes proposed; some of them support color images with a limited number of color levels while a few others achieve the property of no pixel expansion

Visual cryptography schemes using compressed random shares
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Visual cryptography is one of the most secure techniques the allows the user to encrypt the secret images by transforming them into printable transparent sheets and these sheets can be distributed to different intended person through various mediums (physically, internet)

A novel approach for visual cryptography using a watermarking technique
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Visual Cryptography is a new cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decryption can be performed by human, without any decryption algorithm. Here we discuss a new approach for visual

RGB based secret sharing scheme in color visual cryptography
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Information hiding in the communication spectrum became a critical task. The Visual Cryptography is a type of cryptography that allows the image to be divided into multiple numbers of shares called transparent shares and then transmission of images. The intruder

DWT-SVD based secured image watermarking for copyright protection using visual cryptography
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In this paper, a new robust watermarking technique for copyright protection based on Discrete Wavelet Transform and Singular Value Decomposition is proposed. The high frequency subband of the wavelet decomposed cover image is modified by modifying its

An improved pixel sieve method for visual cryptography
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Visual cryptography encodes a secret image into n shares which are distributed to n participants. Pixel Sieve method was proposed recently to encode an image into shares, but the encryption quality is poor. In this paper an improved version of pixel sieve method is


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