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

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

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

Short URL: ia.cr/2003/227