Encryption Algorithms

Symmetric Cryptography

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DES a symmetric algorithm

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Asymmetric Cryptography

The concept of Asymetric Cryptography, also called Public Key Cryptography, was described for the first time by Whitfield Diffie and Martin Hellman in 1976. In contrast to the Symmetric Cryptography in which we have the same secret key for encryption and decryption, we now have one public key $e_{P}$ (ecncryption key) and one private key $d_{P}$ (decryption key) for each person $P$ . While the public key $e_{P}$ can be published to the whole world the private key $d_{P}$ is to be treaten as a secret and only the person $P$ knows it. An important characteristic of such a crypto system is that it is computationally infeasible to determine the private key given the corresponding public key.