Patent ID: 6381695
Filing Date: 2002-04-30
Classification: H04L

Abstract:
An encryption system with time-dependent decryption, including a time-key manager for guaranteeing that a time for enabling decryption of information is limited,(1) wherein upon receipt of a request from an information server, said time-key manager transmits to said information server, a time-key certificate including disclosure time and a public key for encryption and said time-key certificate including no subject information; and (2) wherein said information server transmits to an information user, information encrypted using said public key, which is included in said time-key certificate, said time-key manager, following receipt of a request from said information user for a decryption key, transmits said decryption key to said information user at such time said disclosure time has been reached; said decryption key being a private key, generated and having been kept secret from the time of generation by said time key manager.