Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

5-2005

Abstract

Existing key management schemes can secure group communication efficiently, but are failed on protecting the Group Dynamic Information (GDI) that may undermine group privacy. Recently, Sun et al. proposed a scheme to hide the GDI with batch updating and phantom members inserting so that an adversary is not able to estimate the number of group members. In this paper, we first point out that their scheme is only applicable in departure-only group communication instead of the common conference groups. Secondly, we introduce our method of estimating the group size at a higher confidence level given a prior departure probability. Further, to enhance GDI protection and extend the application fields, we propose to protect GDI with two new mechanisms: chameleon member identifications and virtual departure events. The proposed scheme is effective to protect both centralized groups and contributory groups. The simulation shows that our scheme is better on protecting the GDI.

Discipline

Information Security

Research Areas

Cybersecurity

Publication

Security and Privacy in the Age of Ubiquitous Computing: IFIP TC11 20th International Information Security Conference May 30-June 1, Chiba, Japan

Volume

181

First Page

459

Last Page

475

ISBN

9780387256603

Identifier

10.1007/0-387-25660-1_30

Publisher

Springer

City or Country

Berlin

Copyright Owner and License

Authors

Additional URL

https://doi.org/10.1007/0-387-25660-1_30

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