01-06-2012, 01:12 PM
MESSAGE SECURITY
MESSAGE SECURITY.ppt (Size: 224 KB / Downloads: 41)
Introduction
Security has always been a big issue in the question of IT use .
Internet creates many opportunities for a company, but it also gives the possibility for security risks.
An e-commerce system multiple users in the network. Those users have to communicate securely with each other so that they are able to do business over the Internet. For this reason two main issues are necessary: the information has to authenticated & secure.
ENCRYPTIONS
Secret Key Encryption-Symmetric Encryption
Public Key encryption-Asymmetric Encryption
Secret Key Encryption-Symmetric Encryption
Encryption is the process of scrambling a message in order to hide its content, thus providing confidentiality.
The Secret Key Encryption uses the same key for encrypting and decrypting the information.
Sender as well as the receiver has to use the identical key. Secret key algorithms work well when sender and receiver can arrange to exchange the key.
But there exists a big risk while using this form of encryption. When transmitting the key over a public network, an unofficial user can capture it.
Public Key encryption
Public Key Cryptography, and it is a form of encryption where keys are kept in pairs. Typically the users create a matching key pair and make one of the keys public while keeping the other one secret. The two keys are therefore called public and private key. This key pairs generally can be created and updated by the users themselves. Asymmetric encryption systems have the advantage that by knowing only one key, it is impossible to trivially guess the other one.