title: Elliptic Curve Cryptography
body: <p>I’m studying “Elliptic Curve Cryptography”. It seems like that; it is very hard to understand the concept of “Identity Element”. </p>
  
  <p>Actually my question is why we need “Identity Element”? As far as I understood, we need “Identity Element” in order to define inverse –P of any group element P.
  Am I correct?</p>
  
  <p>Moreover can somebody show me some introductory material on elliptic curve cryptography?</p>