PROBLEM TO BE SOLVED: To establish a relationship of trust in a communication system in which two communication entities seek to have a private or confidential communication session.;SOLUTION: The relationship of trust is based on determination of a shared secret which is generated from context information. The context information can be derived from circumstances around the communication session. For example, the context information can include topology information, time-based information and transaction information. The shared secret may be self-generated or received from a third party. In either case, the shared secret may be used as a key material for an encryption protocol used between the communication entities.;COPYRIGHT: (C)2012,JPO&INPIT
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