Saturday, February 2, 2013

Modern Cryptography


Modern Cryptography
Symmetric key cryptography:
It refers to encryption methods in which both sender and receiver share the same key. It is the traditional encryption policy that was invented in 1976. It has the block cipher as well as stream cipher for their elimination for their application.
            The cryptographic functions do not use keys but are related and important class of cryptographic algorithms. They take input data and produces output data in a short fixed manner.

Public key cryptography:
In Public key cryptology there are two differences but are mathematical related keys are used.
1.     Public Key
2.     Private Key
A public key system is constructed in a manner so that calculation of one key (Private Key) is infeasible from the other key.
In public key cryptology may be freely distributed while its paired private key must remain secret.
The public key is typically used for encryption and private key is used for decryption in other manner we can describe it as one key is used to process the message and other key is used for verification.

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