Cryptology ePrint Archive: Report 2014/046

Crypto-analyses on “user efficient recoverable off-line e-cashs scheme with fast anonymity revoking”

Yalin Chen and Jue-Sam Chou

Abstract: Recently, Fan et al. proposed a user efficient recoverable off-line e-cash scheme with fast anonymity revoking. They claimed that their scheme could achieve security requirements of an e-cash system such as, anonymity, unlinkability, double spending checking, anonymity control, and rapid anonymity revoking on double spending. They further formally prove the unlinkability and the un-forgeability security features. However, after crypto-analysis, we found that the scheme cannot attain the two proven security features, anonymity and unlinkability. We, therefore, modify it to comprise the two desired requirements which are very important in an e-cash system.

Category / Keywords: cryptographic protocols / anonymity, unlikability, cryptanalysis

Date: received 18 Jan 2014

Contact author: jschou at mail nhu edu tw

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Version: 20140120:075625 (All versions of this report)

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