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Visual cryptography


One of the favorite alternatives for image encryption is visible cryptography. Secret writing concepts are being used to encrypt a hidden knowledge image in to the shares (personalized versions of the initial image) which is often sent over an undeveloped communication route and by overlapping shares, the secret meaning is obtained

Visual cryptographic solutions derive from binary or binaries inputs. Due to this, natural images must be first altered into halftone (this is a technique which uses different density of dots to display the image) images to simulate the original gray or color levels in the prospective binary image

To make the stocks, the halftone version of the input image is utilized instead of the initial image. The decrypted image is made by stacking the shares together. Because binary data can be exhibited in an obvious form when branded on transparencies or seen on the screen and overlapping stocks that contain seemingly arbitrary information can expose the trick image. However, the decrypted image is darker, includes a number of visual injuries due to the algorithm that is used for the procedure and the quality of key image is increased by the majority of visual cryptography solutions (Lukac at el, 2005) and(Lukac 2006).

1. 1 Objectives

The basic of protected communication among users using insecure route is known as cryptography. For cryptographic security to occur, an algorithm is included for the practice of encrypting and decrypting messages

In its basic form, one image is split into two individual images called stocks. When the shares are stacked together with each other, the unique image is retrieved

An over-all n out of n aesthetic cryptography scheme includes n participants when a secret image is put into n arbitrary looking shares and all n shares must recover the initial image.

1. 2 Aims

The top idea behind Aesthetic Cryptography is to encrypt information by means of images in a secure and perfect way

The information must be encrypted before it is sent, so that it can't be illegally read or revised in the middle of transmission. Suppose 4 individuals have transferred their money in a bank account. These persons naturally do not trust each other. In particular, they don't want a single member of themselves to withdraw the money. However, they expect that withdrawing money by two customers of the group is not considered a conspiracy; alternatively it is known as to have received authorizations

Therefore, they made a decision to set the bank code (with a reliable computer) into 4 partitions so that any two or more partitions can be used to reconstruct the code. Because the person's representatives will not have your personal computer with them to decode the lender code when they come to withdraw the money, they want to be able to decode aesthetically: each thief gets a transparency

The transparency should yield no information about the lender code (even implicitly). However, by taking any two transparencies, stacking them mutually and aligning them, the secret number should pop out. How do this be done? (Naor and Shamir, 1994) proposed a solution and introduced a straightforward but correctly secure way that allows secret sharing without the cryptographic computation, that they termed as Visual Cryptography Scheme. The simplest Visual Cryptography Program is given by the following setup. A magic formula image includes a assortment of dark-colored and white pixels where each pixel is cared for independently

To encode the secret, the original image is split into n customized types (known as stocks). To decode the image, a subset S of these n shares is chosen and display each of them onto a transparency

With this project, a fresh visual cryptography system is supposed for shadow images. The proposed program will be versatile, easily integrated, and better for shadow images. Additionally, shadow image composition is augmented to reduce the chances for an attacker to suppose the secret.


Literature Survey

2. 1 introduction

Visual Cryptography was created by (Naor and Shamir, 1994) at Eurocrypt, an gross annual meeting sponsored by the International Connection for Cryptographical Research (IACA) to encourage conversations and training seminars among cryptologists all over the world

In that, the description is about a fresh cryptographic scheme that encodes a dark and white image into n shares. Decoding is performed with the human being visible system when the n stocks are located on transparencies and stacked on top of one another. They included several strategies to implement a visual cryptography system in their presentation

Since that time, the paradigm of aesthetic cryptography has fascinated wide attention all over the world. Several papers and assignments have been presented to extend visual cryptography. Plans have come to exist for an over-all k out of n sharing scheme and also to cover gray size and colour images as well(Jim Cai and Zhou, 2000)

Right now, research continues in the field of aesthetic cryptography and documents regarding contrast, expanded strategies are being posted regularly

This research addresses the few questions regarding visual cryptography, and can try to answer these questions in the framework of the research by using experimental procedure into the problem of visual cryptography, these questions are: what is cryptography? What set of features should be used in aesthetic cryptography? How to reduce chances for attackers to get the secret of shadow images?

2. 2 Theory

This section will attempt to explain the essential theory behind visual cryptography. Consider a dark and white image (not grey scale). It is composed of dark-colored pixels and white pixels grouped such that when viewed with the human eye, the picture (or term, symbol etc. ) is seen. To encrypt this image, each pixel from the original image is considered and converted into sub pixels. For sake of this discussion and for simplicity, let us assume that every pixel will be converted into two sub pixels and you will see two shares

If the pixel is white, then one of two combinations of sub pixels will be arbitrarily chosen to represent the pixel on each one of the shares. If the stocks are stacked and properly lined up, the sub pixels for the white pixel produce the result

In both sets of sub pixels for the white pixel, it can be seen the effect is one dark sub pixel and one white sub pixel next to one another. When viewed with the real human visual system, the effect appears to be gray (mixed aftereffect of white and black next to one another)

On the other hand, if the pixel is black, then one of the two combinations of sub pixels will be arbitrarily chosen to represent the pixel in each one of the shares (same idea as the white pixel). However with dark-colored pixels gives two sub pixels next to one another. To the eye, this appears as a talk about by itself provides no noticeable information from the initial image because the sub pixels are evenly allocated on each share (one black sub pixel and one white sub pixel for each pixel in the initial image). These combinations (dark/white and white/dark-colored) occur with likelihood 1/ 2 providing a share with randomized pixels and so not uncovering any hint of the initial image. When the shares are stacked, the white pixels have emerged as gray, as the black areas stay dark (Naor at el, 1994, Lee at el, 2003 and Voyatzis, 1996)

(Naor and Shamir, 1995) considered the problem of encrypting material such as: branded text, handwritten records, pictures, etc within an absolutely secure way which is often interpreted directly by the real human visual system

Furthermore, they may have explained that the basic model includes a printed webpage of cipertext (which can be sent by email of faxed) and a published transparency. The system they developed can be utilized by anyone who lacks knowledge of cryptography and without doing any cryptographic commutations. Moreover, they observed that the ultimate way to visualize the aesthetic cryptographic plan is to consider a concrete example

In cryptography, the process of transforming data (referred to as plaintext) where the process uses an algorithm (called cipher) is called encryption. The encrypting process make the information unreadable to anyone except those possessing special knowledge, usually referred to as a key. The encrypting process results encrypted data (in cryptography, known as cipher content material). To read encrypted data, the encrypted data should be made readable. Therefore the reverse process is called decryption. In real world, the program for encryption can typically also perform decryption to help make the encrypted information readable again (ElGamal, 1985 and Rivest, 1978)

Encryption has long been employed by militaries and government authorities to facilitate secret communication. Encryption is currently used in guarding information within many sorts of civilian systems, such as computers, storage devices (e. g. USB flash drives), systems (e. g. the Internet, e-commerce), mobile telephones, cordless microphones, wireless intercoms systems, Bluetooth devices and bank automated teller machines. Encryption is also used in digital protection under the law management to avoid unauthorized use or duplication of copyrighted material and in software also to protect against reverse engineering (Encryption)

Encryption, alone, can protect the confidentiality of communications, but other techniques are still needed to protect the integrity and authenticity of a note; for example, confirmation of a message authentication rules (MAC) or an electronic signature. Specifications and cryptographic software and hardware to execute encryption are accessible, but effectively using encryption to ensure security may be considered a challenging problem. An individual slip-up in system design or execution makes it possible for successful problems. Sometimes an adversary can obtain unencrypted information without immediately undoing the encryption. (Maurer, 1994 and Diffie, 1976)

Additionally, The optimality of VC is determined usually by its pixel enlargement and the relative contrast and, the comparative contrast must be as large as is possible to ensure visibility (Alvarez at el, 2005). Within the scope of the research, the works related to compare optimization will be explored. Works related to deriving lower bound of pixel expansion m can be found in (Naor and Shamir, 1995), (Rivest at el, 1984) etc. The research on contrast search engine optimization was determined by the condition of extra graying erect launched to decoded image. This occurs because the decoded image is not an exact reproduction of the original image, but an development of the initial, with extra dark pixels.


Research methods

-Doing an intensive exploration into basic visual cryptography

-Careful analysis of algorithms used in visual cryptography

-Checking out a suitable development environment and the right frame work that can alleviate the image handling tasks

-investigating shadow image composition for visual cryptographic techniques such as pixel expansion and the comparative contrast

-This project emphasizes, intends and evaluates a computer-based system using appropriate operations and tools, as follows

Entry End :Java

Again End :Microsoft SQL Server

OS : Windows XP and Windows vista

IDE : world wide web beans 6. 7

The net bean IDE is employed for following features:

In this project, net beans Included Development Environment (IDE) can be used because its tools, debugging and performance monitoring. Net bean IDE for developing applications saves the time by managing house windows, options, and data. Furthermore, an IDE can store repeated responsibilities through macros and abbreviations. Drag-and-drop features make creating graphical user interface (GUI) components or accessing directories easy and highlighted code and debugging features alert to mistakes in the code

The application is produced by java because of following features

- Java is a graphical user interface programming language

- Java facilitates to platform unbiased mechanism

- Java is an over-all purpose and subject oriented encoding language

- Probably the most striking top features of the terms are that it's platform neural language

- Java program is under the control of JVM; the JVM can contain the program and stop it from creating side effects outside the system. Thus safe practices is included in Java dialect.

Java is principally adopted for two reasons

- Security

- Portability

Both of these features are available in java as a result of byte code. Byte code is an extremely optimized group of instructions to be executed by the Java run time system called JVM. The features of Java that are adopted for the network system explore are

- Multithreading

- Socket programming

- Swing


Users understand that their world is filled with multiple occurrences all happenings at once and needs their personal computers to do the same. Regrettably, writing programs that deal with many things at once can be much more difficult than writing normal single threaded programs in C or C++. Thread safe in multithreading means a given collection functions is implemented concurrent threads of execution


Swing identifies the new catalogue of GUI adjustments (switches, sliders, checkboxes etc). Swing action is an instant GUI development tool that is area of the standard Java development set up. Swing is a set of classes that delivers more powerful and adaptable components. Swing components aren't implemented by platform specific code. Instead these are written in Java and therefore are platform self-employed (java doc).

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