Cryptology ePrint Archive: Report 2004/262

Universal Forgeability of a Forward-Secure Blind Signature Scheme Proposed by Duc et al.

Lihua Liu and Zhengjun Cao

Abstract: Duc et al. proposed a forward-secure blind signature scheme in [1]. They claimed that the scheme is constructed from the provably secure Okamoto-Guilou-Quisquater blind signature scheme. But we recently found that their scheme is insecure. In the paper, we show the scheme is universally forgeable by a simple and direct attack.

Category / Keywords: cryptographic protocols / Blind signature, Universal forgeability.

Date: received 13 Oct 2004

Contact author: zjcamss at hotmail com

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Version: 20041014:103911 (All versions of this report)

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