Cryptology ePrint Archive: Report 2010/400

Security Analysis of a Threshold Proxy Signature Scheme

Kitae Kim and Dahun Nyang

Abstract: The t-out-of-n threshold proxy signatures allow an original signer to delegate his signing capability to a group of proxy signers, and t or more proxy signers can generate valid signatures by cooperating. Recently, Liu and Huang proposed a variant of threshold proxy signature scheme in which all proxy signers remain anonymous. The authors claimed their construction satisfies unforgeability, proxy signer's deviation, identifiability, undeniability and verifiability. In this paper, however, we show that their scheme does not provide the proxy signer's deviation and identifiability requirements.

Category / Keywords: public-key cryptography / anonymity, cryptanalysis, digital signatures, threshold cryptography

Date: received 15 Jul 2010

Contact author: ktkim at inha ac kr

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Version: 20100716:030921 (All versions of this report)

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