cryptography

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An Overview of Cryptography

http://www.garykessler.net/library/crypto.html Does increased security provide comfort to paranoid people? Or does security provide some very basic protections that we are naive to believe that we don't need? During this time when the Internet provides essential communication between tens of millions of people and is being increasingly used as a tool for commerce, security becomes a tremendously important issue to deal with. There are many aspects to security and many applications, ranging from secure commerce and payments to private communications and protecting passwords. One essential aspect for secure communications is that of cryptography, which is the focus of this chapter. But it is important to note that while cryptography is necessary for secure communications, it is not by itself sufficient .

What is a Digital Signature?

http://www.youdzone.com/signature.html Bob's Public key is available to anyone who needs it, but he keeps his Private Key to himself. Keys are used to encrypt information. Encrypting information means "scrambling it up", so that only a person with the appropriate key can make it readable again. Either one of Bob's two keys can encrypt data, and the other key can decrypt that data. Susan (shown below) can encrypt a message using Bob's Public Key.

The Creation & Solution of Simple Substitution Ciphers

http://www.codasaurus.com/Cipher-1.htm A simple substitution cipher is one in which each letter of the original text is replaced by a different letter. For example, if you wanted to encipher: Now is the time for all good men to come to the aid of their country.
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MR01001101 :: cryptography steganography resources and challenges

http://users.telenet.be/d.rijmenants/en/visualcrypto.htm

Visual Cryptography - StumbleUpon

What is Visual Cryptography Visual Cryptography is a special encryption technique to hide information in images in such a way that it can be decrypted by the human vision if the correct key image is used. The technique was proposed by Naor and Shamir in 1994. Visual Cryptography uses two transparent images. One image contains random pixels and the other image contains the secret information. It is impossible to retrieve the secret information from one of the images.