Forgery of Provable Secure Short Signcryption Scheme

Chik-How TAN  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E90-A   No.9   pp.1879-1880
Publication Date: 2007/09/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e90-a.9.1879
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
cryptography,  signcryption,  

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Summary: 
In this paper, we analyse Ma signcryption scheme [4] proposed in Inscrypt'2006. Although Ma signcryption scheme [4] is probably secure against adaptive chosen ciphertext attacks and forgery, we show that Ma signcryption scheme is easily forgeable by the receiver and the receiver can impersonate the sender to forge any valid signcryption to any receiver.