Patent ID: 6742116
Filing Date: 2004-05-25
Classification: H04L

Abstract:
A method of ensuring privacy and security in a communication system as an electronic conference room where a plurality of user terminals communicate with one other over a network, said method comprising:detecting predetermined changes in the electronic conference room; designating the detected changes as coordinated events; generating a series common key at each of the user terminals, each of the common keys being generated based upon the coordinated events; storing at each of the user terminals the generated common keys, each common key having a unique index identifying that common key; encrypting at sending user terminals a communication using one of the stored common keys; transmitting over the network from the sending user terminal the encrypted communication along with one of the indexes corresponding to the one specific common key used to encrypt the communication; and receiving at receiving user terminals the encrypted communication along with an index that identifies the common key used for encrypting the encrypted communication; and decrypting in the receiving user terminals the encrypted communication using the common key identified according to the index.