Patent ID: 7716482
Filing Date: 2010-05-11
Classification: H04L

Abstract:
1. A method of operating an ID-based cryptographic system via a computer, the ID-based cryptographic system including a session initiating party and a plurality of session participating parties, by distributing a session shared key for encryption from the session initiating party to the plurality of session participating parties in a single conference session via the computer, the method comprising: (a) generating two temporary secret keys for the session initiating party, two temporary public keys for the session initiating party, and a signature value obtained by applying a predetermined signature function to the two temporary public keys for the session initiating party; (b) sending a message, including ID information of the session initiating party, the two temporary public keys for the session initiating party, and the signature value, to each session participating party; (c) receiving messages, including two temporary public keys for each session participating party, from each session participating party, and determining validity of the messages; (d) generating shared key generation variables for each session participating party that has sent a valid message; (e) generating the session shared key and encrypting the ID information of the session initiating party using the session shared key; and (f) sending a message including the shared key generation variables and the encrypted ID information to each session participating party that has sent a valid message.