FIELD: physics, communications.
SUBSTANCE: invention relates to data transmission networks. The essence of the invention lies in that, in a communication system in which two communication objects attempt to establish a private or confidential communication session, trust relationships must be established first. The trust relationships are based on determining a shared secret, which in turn is formed from context information. Context information can be extracted from the medium in which the communication session is established. For instance, context information may include topology information, time-based information and transaction information. The shared secret can be formed independently or can be received from a third party. In any case the shared secret can be use as key material for any cryptographic protocol used between communication objects.
EFFECT: increased communication safety.
40 cl, 6 dwg
