Cryptology ePrint Archive: Report 2003/227

Attacks on a Secure Group Communication Scheme With Hierarchical Access Control

Willi Geiselmann and Rainer Steinwandt

Abstract: At ICICS 2001, Zou, Ramamurthy, and Magliveras proposed CRTHACS, a chinese remainder theorem based scheme for secure group communication with hierarchical access control. The scheme is designed in such a way that the underlying hierarchy remains hidden from the participating parties/users. This contribution describes several practical attacks on CRTHACS which can reveal significant parts of the hierarchy.

Category / Keywords: cryptographic protocols / hierarchical access control, cryptanalysis

Date: received 31 Oct 2003

Contact author: steinwan at ira uka de

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Version: 20031031:162757 (All versions of this report)

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