Cryptanalysis of an Identity Based Proxy Multi-Signature Scheme

Fagen LI  Shijie ZHOU  Rong SUN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.7   pp.1820-1823
Publication Date: 2008/07/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.7.1820
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Cryptography and Information Security
proxy multi-signature,  bilinear pairings,  forgery attack,  

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In a proxy multi-signature scheme, a designated proxy signer can generate the signature on behalf of a group of original signers. Recently, Wang and Cao proposed an identity based proxy multi-signature scheme along with a security model. Although they proved that their scheme is secure under this model, we disprove their claim and show that their scheme is not secure.