Cryotography an overview

In this paper introducing the basic terms used in cryptography and then move on to discuss public key cryptography in more detail. We give the definitions of two public key systems, one for key exchange and one for encryption, and show how they can be adapted for use with elliptic curves. Most of the cryptographic definitions and explanations are well known and here the basics are discussed. Elgamal cryptosystems and Diffie- Hellman Cryptosystem is explained.