Cryptographic computation method for participants of voice over Internet protocol (VoIP) connection involves performing cryptographic computation at least partly in safety module after accomplishing part of key administrative minutes

摘要

A VoIP connection is established. At least a part of key administrative minutes is accomplished and a cryptographic computation is planned for mutual authentication of the participants and for the production and exchange of keys between the participants. The cryptographic computation is at least partly executed in a safety module (12,22) equipped with a microprocessor chip.