The present invention provides a public key cryptosystem with an elliptic curve which comprises the steps of informing public data, selecting first and second privacy keys at the end of first and second users, mutually notifying numbers calculated by the public data and the first and second privacy keys,...http://www.google.de/patents/US5272755?utm_source=gb-gplus-sharePatent US5272755 - Public key cryptosystem with an elliptic curve
