Security and privacy are critical for electronic communication and e-business. Network security measures are needed to protect data during its transmission. Cryptography plays a vital role in network security as it allows two parties to exchange sensitive information in a secured manner. The word cryptography means covered writingâ„¢. The art or science of transforming an intelligible message into unintelligible one and then retransforming that message back to its original form is cryptography. There are two types of cryptography: asymmetric cryptography and symmetric cryptography.
If the sender and the receiver use different keys. It is called asymmetric or multiple-key, public-key encryption. If the sender and the receiver use the same key it is called single key, secret-key or conventional encryption. It involves the use of a symmetric cryptography. secret key known only to the participants of the secure communication: If A wants to send a message to B, he encrypts the original message X by the encryption algorithm using the key agreed upon by them.
The encrypted message is through the communication media transmitted a secured and the key is transmitted through RF cable, fiber, tc.The receiver media like decrypts the original message from the encrypted message using the same key and the decryptor. A cryptanalyst may try to capture the message and the key. If he fails to do so, the encryption algorithm is successful.