Secret shared context limited. In a communication system in which two communication entities seek to have a private or confidential communication session, a trust relationship needs first to be established. The relationship of trust is based on Determination of a shared secret, which, in turn, is generated from contextual information.Contextual information can be derived from the circumstances surrounding the session of communication. For example, the contextual information may include topological information, information based on time information, and transaction. The secret sharing can be self - ge Rado or received from a third party.In any event, the secret sharing can be used as a material for any cryptographic key protocol used between the communication entities.
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