Encryption is the process of converting an received message into a form that is unreadable to unauthorized individuals, that is to anyone without the tools to convert the encrypted message hold up to its original format. Encryption is used to protect various forms of information or data. Decryption is the process of converting the cipher text message back into plain text so that it can be pronto understood. If there is encryption, you will need decryption in state to decode or read the encrypted message or information and secret code, which is called the key.
Encrypting data is used to protect the elements of computer security (Conklin), these are
1. Authenticity
2.
Integrity
3. Confidentiality
There are two basic techniques for encrypting information: symmetric encryption (also called secret key encryption) and asymmetric encryption (also called popular key encryption.). (Microsoft, 2007)
Symmetric encryption is the oldest and best-known technique. A secret key, which can be a number, a word, or plainly a string of random letters, is applied to the text of a message to change the content in a grouchy way. This might be as simple as transformation each letter by a number of places in the alphabet. As long as both sender and pass receiver know the secret key, they can encrypt and decrypt all messages that use this key.
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