Patent ID: 6377688
Filing Date: 2002-04-23
Classification: H04L

Abstract:
A cryptographic communication system having a transmitter, a receiver and a server, wherein said system being characterized in that:(1) said server has means for creating a pair of public keys (P, N) and a secret key S, and means for opening said public keys to the public; (2) said transmitter has means for encrypting a message M using said public keys (P, N) as a message M0, and means for sending said message M0 to said receiver; (3) said receiver has means for encrypting said message M0 using a specified random number XR as a message M1, and means for sending said message M1 to said server; (4) said server has means for decrypting said message M1 using said secret key S as a message M2, and means for sending said message M2 to said receiver; and (5) said receiver has means for decrypting said message M2 using said specified random number XR as a message M3.