Cryptology ePrint Archive: Report 2015/945

Secure Set-based Policy Checking and Its Application to Password Registration

Changyu Dong and Franziskus Kiefer

Abstract: Policies are the corner stones of today's computer systems. They define secure states and safe operations. A common problem with policies is that their enforcement is often in conflict with user privacy. In order to check the satisfiability of a policy, a server usually needs to collect from a client some information which may be private. In this work we introduce the notion of secure set-based policy checking (SPC) that allows the server to verify policies while preserving the client's privacy. SPC is a generic protocol that can be applied in many policy-based systems. As an example, we show how to use SPC to build a password registration protocol so that a server can check whether a client's password is compliant with its password policy without seeing the password. We also analyse SPC and the password registration protocol and provide security proofs. To demonstrate the practicality of the proposed primitives, we report performance evaluation results based on a prototype implementation of the password registration protocol.

Category / Keywords: cryptographic protocols / policies, private set operations, passwords

Original Publication (with minor differences): 14th International Conference on Cryptology and Network Security (CANS 2015)

Date: received 28 Sep 2015

Contact author: f kiefer at surrey ac uk

Available format(s): PDF | BibTeX Citation

Version: 20150928:195620 (All versions of this report)

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