07-06-2013, 03:33 PM
EMBEDDED EXTENDED VISUAL CRYPTOGRAPHY SCHEMES
EMBEDDED EXTENDED.docx (Size: 1.1 MB / Downloads: 42)
ABSTRACT:
A visual cryptography scheme (VCS) is a kind of secret sharing scheme which allows the encoding of a secret image into shares distributed to participants. The beauty of such a scheme is that a set of qualified participants is able to recover the secret image without any cryptographic knowledge and computation devices. An extended visual cryptography scheme (EVCS) is a kind of VCS which consists of meaningful shares (compared to the random shares of traditional VCS). In this paper, we propose a construction of EVCS which is realized by embedding random shares into meaningful covering shares, and we call it the embedded EVCS. Experimental results compare some of the well-known EVCSs proposed in recent years systematically, and show that the proposed embedded EVCS has competitive visual quality compared with many of the well-known EVCSs in the literature. In addition, it has many specific advantages against these well-known EVCSs, respectively.
PROJECT URPOSE:
Purpose of a VCS with random shares the traditional VCS or simply the VCS. In general, a traditional VCS takes a secret image as input, and outputs shares that satisfy two conditions: 1) any qualified subset of shares can recover the secret image; 2) any forbidden subset of shares cannot obtain any information of the secret image other than the size of the secret image.
PROJECT SCOPE:
System provides a friendly environment to deal with images. Generally tools supports only one kind of image formats. Our application supports .gif and .png (portable network graphics) formatted images and our application has been developed using swing and applet technologies, hence provides a friendly environment to users.
VCS of an EVCS, we mean a traditional VCS that have the same access structure with the EVCS. Generally, an EVCS takes a secret image and original share images as inputs, and outputs shares that satisfy the following three option:
1) any qualified subset of shares can recover the secret image;
2) any forbidden subset of shares cannot obtain any information of the secret image other than the size of the secret image;
3) all the shares are meaningful images.
PRODUCT FEATURES:
EVCS is flexible in the sense that there exist two trade-offs between the share pixel expansion and the visual quality of the shares and between the secret image pixel expansion and the visual quality of the shares. This flexibility allows the dealer to choose the proper parameters for different applications. Comparisons on the experimental results show that the visual quality of the share of the proposed embedded EVCS is competitive
with that of many of the well-known EVCSs in the literature.
INTRODUCTION:
THE basic principle of the visual cryptography scheme (VCS) was first introduced by Naor and Shamir. VCS is a kind of secret sharing scheme that focuses on sharing secret images. The idea of the visual cryptography model proposed in is to split a secret image into two random shares (printed on transparencies) which separately reveals no information about the secret image other than the size of the secret image. The secret image can be reconstructed by stacking the two shares. The underlying operation of this scheme is logical operation OR.
In this paper, we call a VCS with random shares the traditional VCS or simply the VCS. In general, a traditional VCS takes a secret image as input, and outputs shares that satisfy two conditions: 1) any qualified subset of shares can recover the secret image; 2) any forbidden subset of shares cannot obtain any information of the secret image other than the size of the secret image. An example of traditional (2,2)-VCS can be found in Fig. 1, where, generally speaking, a –VCS means any out of shares could recover the secret image.
SYSTEM ANALYSIS:
PROBLEM DEFINITION:
Whenever we transmit the data (image) in the network, any unauthenticated person can read our data (image). In order to provide security to data (image) generally sender will encrypt the data (image) and send it the intended person and the receiver will decrypt the encrypted data(image) and uses it.
EXISTING SYSTEM:
Visual cryptography is the art and science of encrypting the image in such a way that no-one apart from the sender and intended recipient even realizes the original image, a form of security through obscurity. By contrast, cryptography obscures the original image, but it does not conceal the fact that it is not the actual image.
LIMITATIONS OF EXISTING SYSTEM:
The existing system does not provide a friendly environment to encrypt or decrypt the data (images).
PROPOSED SYSTEM:
Proposed system Visual cryptography provides a friendly environment to deal with images. Generally cryptography tools supports only one kind of image formats. Our application supports .gif and .png (portable network graphics) formatted images and our application has been developed using swing and applet technologies, hence provides a friendly environment to users.
ADVANTAGES OF PROPOSED SYSTEM:
EVCS is flexible in the sense that there exist two trade-offs between the share pixel expansion and the visual quality of the shares and between the secret image pixel expansion and the visual quality of the shares. This flexibility allows the dealer to choose the proper parameters for different applications. Comparisons on the experimental results show that the visual quality of the share of the proposed embedded EVCS is competitive
with that of many of the well-known EVCSs in the literature.