Advantages And Disadvantages Of Visual Cryptography

Encryption of data stored on media is used to protect the data from unauthorized access should the media ever be stolen.

Goal of coding theory is different to data hiding method even though both methods use the error correction codes [23]. In coding theory, syndrome equation in the first stage of decoder block is used to detect and correct error which is not expected in advance at the encoder block, whereas in data hiding, syndrome is used to choose proper coefficients to insert a watermark signal and decrease distortion. In the embedding process, by choosing proper e(x), some of the host image bits are modified intentionally.

Multimedia content is also in collaboration with Encryption & Decryption standards (CBR).The below paper is the general

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

To achieve this goal, I have organized my paper into three different sections. Each section will focus on a segment on the history of encryption. In the first section I discuss classical and medieval encryption methods: steganography, and substitution ciphers. In the second section I will exclusively talk about encryption methods used in World War II, such as: Enigma Machine, and JN-25. In the third section I will talk about modern encryption methods: symmetric vs asymmetric key systems. Lastly I will conclude with a finishing paragraph, with my works cited.

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

Dead files by dead accounts may not be removed without the cooperation of the corresponding users. In the paper “Steganographic Schemes for File System and B-Tree” [3], they have introduced StegFD, a practical scheme to implement a steganographic file system in which a plausible deniability to owners of protected files is offered. StegFD hides the selected files in a file system securely in such a way that, an attacker will not be able to trace their existence, even if the attacker has full knowledge of the hardware and software and data structures of the file system .They have also proposed two schemes for implementing Steganographic B-trees in a StegFD volume. In paper “A Multi-User Steganographic File System on Untrusted Shared Storage” [4] the threat to steganographic file systems (StegFS) is described which arises when the storage system is untrusted and is shared by multiple users. In such cases, the attacker could obtain multiple snapshots of the storage content and analyze them to deduce the existence of secret user data. To solve this problem, they have introduced a Dummy-Relocatable Steganographic (DRSteg) file system. It employs new techniques to share and relocate dummy data at

Steganography is art of hiding the secret message within an ordinary message and extraction of its destination. Steganography take cryptography a step farther by hiding an encrypted message so that no one finds the existence of the message. If anyone scans your data will fail to know that it contain encrypted data. Steganography maintain the secure communication between the communicating parties. There are different techniques that are used for hiding the secret data as Steganography, Cryptography and Watermarking. There are various drawbacks of the cryptography that are covered by the Steganography. This paper reviews the Steganography techniques and various matrices for performance analysis of Steganography techniques.

Image Steganography: In today’s digital world secret messages get embedded in to the digital image which is called as Image Steganography where cover object used is Image . Because of the limited power of the Human vision system this method is most commonly used [5].

In the present world lot of multimedia data is exchanged on internet and the percent of image data in that is highest. So we need to securely transmit that and this can be achieved by Image encryption.

The core idea of this image encryption scheme (Tiegang Gao et al.,2007) is based on total shuffling matrix using the Logistic map, and the substitution of the shuffled image with a keystream

Today web is going towards the multimedia data in which image covers the highest percentage of it. But with the ever-increasing growth of multimedia applications, security is an important aspect in communication and storage of images, and encryption is the way to ensure security [1]-[2]. Image encryption techniques try to convert original image to another image that is hard to understand and to keep the image confidential between users, in other word, it’s important that without decryption key no one can access the content. Image encryption has applications in internet communication,

Information sharing is an essential usefulness in distributed storage. In this article, we demonstrate to safely, productively, and adaptably impart information to others in distributed storage. We portray new open key cryptosystems, which create steady size figure messages such that productive assignment of decoding rights for any arrangement of figure writings are conceivable. One can total any arrangement of mystery keys and make them as conservative of a solitary key, yet including the force of every last one of keys being accumulated. As it were, the mystery key holder can discharge a consistent size total key for adaptable decisions of figure content set in distributed storage, yet the other scrambled

DIGITAL image watermarking has become a necessity in many applications such as data authentication, broadcast monitoring on the Internet and ownership identification. Various watermarking schemes have been proposed to protect the copyright information. There are three indispensable, yet contrasting requirements for a