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Efficient key agreement in hierarchical groups. (English) Zbl 0959.68040

Edwards, Jenny (ed.), Computer science. ACSC ’99. Proceedings of the 22nd Australasian conference, Auckland, New Zealand, January 18-21, 1999. Singapore: Springer. Aust. Comput. Sci. Commun. 21(1), 469-479 (1999).
Summary: Hierarchical groups are prevalent in the real world and are always present in any institution or organization. The paper addresses the problem of conference key agreement in groups which exhibit a hierarchical structure. Each group is controlled by a single manager who is responsible for the composition of the group of participants delegated to the conference. After the managers agree on a session key, they can delegate that key to the lower level participants via a broadcast channel. The protocol used to establish a common key between two hierarchical groups is based on the basic Diffie-Hellman key agreement with elements of the STS protocol. Two protocols are defined for delegation by the manager of a group and for participants who wish to pass the delegation along the hierarchy. An evaluation of the protocol is discussed in the context of the goals of the protocol.
For the entire collection see [Zbl 0932.00057].

MSC:

68P25 Data encryption (aspects in computer science)
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