The Basic Model Of Visual Cryptography And The Extended Model

2. Our proposed plan has the capacity bolster dynamic gatherings productively. In particular, new allowed clients can straightforwardly unscramble information records transferred before their investment without reaching with information proprietors. Client repudiation can be effortlessly accomplished through a novel repudiation list without redesigning the mystery keys of the remaining clients. The size and calculation overhead of encryption are consistent and autonomous with the quantity of repudiated clients.

Information security is a major concept in today’s industrial and computer era, so security must be higher to protect the confidential data. Information security plays major role in computer and network security with the use of different cryptography algorithms that includes the encryption and decryption of data with the uses of the algorithm and the key. By means of text or numerical key for the encryption can be dangerous because with the several hack attacks that a key can be broken. So I have proposed a new mechanism that will replace the text key with the image pixels and can gain high security which cannot be easy to break without prior knowledge.

Over the years, cryptography has been used to protect secrets, in a military capacity to make sure that either hackers, enemies of the countries, do not intercept sensitive formation. Ciphers, and encryption blocks are becoming so hard to break even the best super computers cannot break the codes in a timely fashion. Encryption has been improved over the years, also has been around for thousands of years and this paper is intended to explain about different forms of cryptography that either has been used or is still in use to this day. This paper is about

Mainly we get ideas to hide information in images using defined algorithms and crack that secret information again using same algorithms.

Abstract— Steganography is a technique of hiding the secret information. Steganography hides the existence of the secret data and make the communication undetectable. Secret data can be communicated in an appropriate multimedia carrier such as image, audio or video. Image steganography is extensively used technique. In this technique secret data is embedded within the image. Steganography techniques can be categorized into two groups - adaptive and non-adaptive. Each of these have its strengths and weaknesses. Adaptive steganography embeds the secret information in the image by adapting some of the local features of the image. Non-adaptive steganography embeds secret data equally in each and every pixel of the image. Several techniques have been proposed for hiding the

The paper presents an encryption method which is presented with the unusual property that publicly revealing an encryption key does not result in revealing the corresponding decryption key. It has two important consequences

Nowadays, the use of the Internet is almost inevitable, as the use of Internet continually increases providing information security is also very key important. One of the reasons cyber attacks are successful is because the information acquired from the systems are usually readable/unencrypted, attackers can access. This is where information hiding becomes necessary; it 's a branch of computer science that deals with concealing the existence of a message. There are four primary sub-disciplines of information hiding in an undetectable and/or irremovable especially in audio and data

Cryptography is defined as the art or process of writing in or deciphering secret code: any system of secret writing. Encryption is used in electronic systems to achieve privacy and authentication of information. The privacy requires, two questions need to be answered: what are the consequences of unauthorized access to or disclosure of the valuable information, and how often the possibility of unauthorized access to or disclosure of information. Authentication addresses the issues of whether data is from the correct source or if it has been unauthorized with. Functions embedded with in cryptographic systems help ensure data integrity by guaranteeing authenticity of a message and allowing the use of digital signature, a data block attached to a message that binds the message to a sender so that it can be verified by the receiver or others.

In today’s world when whole world become digitized there is need not only to store and transmit data but security is also main concern i.e. transmission of data with high security. In earlier time there ware attempts to hide a message in trusted media so as to deliver it across the enemy territory[1]. In the modern time of digital communication, several methods are used for hiding information in any medium. There are many method one of such technique is steganography[2] in which digital images are used as a medium for hiding secret message or information in the form of various format such as digital images, video or audio file text file. The main goal of steganography is to increase communication security by inserting secret message into the digital image by modifying the pixels of the image which are not very essential. Another most reliable method of information security is cryptography The steganography is differ from cryptography in the way that cryptography main aim is to keeping the contents of a information secret, while steganography main focuses on keeping the existence of a information secret. The science of protecting information which is mainly in the form of plain text, by transforming it (encrypting it) into an unreadable format, which is known as cipher text. Cryptography is the study of changing information from its normal, comprehensible format into an incomprehensible format, rendering it unreadable without secret knowing secret information and is mainly

Since the beginning of civilization, humans have needed a way to communicate in secret. Whether it be a letter to a lover or a set of orders for an army, it would be paramount for these messages to arrive unknown and untouched. However at some point, a person could easily apprehend the message; perhaps a spy or the letter bearer, nevertheless the chance of the message being compromised would be quite high. Thus one would have to change the message to appear as meaningless nonsense to those others than the intended recipient. This idea formed the basis of cryptography, the backbone of digital security.

steganography and cryptography are distinctive sorts of strategies utilization to send secure information transmission. Steganography is the craftsmanship and art of concealing information into distinctive bearer records, for example, pictures, features, sound, content and so forth. In cryptography, there is parcel of degree to discover mystery message that we send by outsider

A Digital image watermarking systems have been proposed as an efficient means for copyright protection & authentication of digital image content against unintended manipulation (spatial chromatic). Watermarking techniques tries to hide a message related to the actual content of the digital signal, watermarking is used for providing a kind of security for various type of data (it may be image, audio, video, etc). Digital watermarking generally falls into the visible watermarking technology and hidden watermarking technology visible and invisible watermarks both serve to deter theft but they do so in very different ways.

The challenges are to introduce a digital watermark that is both transparent and highly robust to common signal processing and possible attacks. The two basic requirements for an effective watermarking scheme robustness and transparency conflict each other. An effective watermarking scheme is achieved by the incorporation of Human Visual System (HVS) models into watermarking scheme using JND. Just Noticeable Distortion (JND) gives us a way to model the HVS accurately and to set a trade-off between two conflicting requirement robustness and imperceptibility [19].

Two set of text images and one true sample image is taken for cryptography. In this proposed work these three images are encrypted into various shares through MATLAB, so that after compiling specific number of share the original image is visible. After encryption the performance analysis is done with the help of PSNR and MSE values.

Aim of my Final Project: The proposed approach in this venture utilizes another steganographic methodology called picture steganography. The application makes a stego picture in which the individual information is implanted and is ensured with a secret word which is very secured.