Cryptology ePrint Archive: Report 2009/057

Anonymity in Shared Symmetric Key Primitives

Gregory M. Zaverucha and Douglas R. Stinson

Abstract: We provide a stronger definition of anonymity in the context of shared symmetric key primitives, and show that existing schemes do not provide this level of anonymity. A new scheme is presented to share symmetric key operations amongst a set of participants according to a $(t,n)$-threshold access structure. We quantify the amount of information the output of the shared operation provides about the group of participants which collaborated to produce it.

Category / Keywords: secret-key cryptography / threshold cryptography

Date: received 4 Feb 2009

Contact author: gzaveruc at cs uwaterloo ca

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Version: 20090206:143759 (All versions of this report)

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