On the security of a proxy signature scheme in the standard model. (12th November 2013)

• Record Type: Journal Article
• Authors: Yuan, Yumin
• Is Part Of: International journal of communication systems. Volume 28:Number 4(2015)
• Page Start: 675
• Page End: 681
• Publication Date: 2013-11-12
• Subjects: Telecommunication systems -- Periodicals; 621.382
• DOI: 10.1002/dac.2695
• Languages: English
• ISSNs: 1074-5351

Abstract

<abstract abstract-type="main"> <title>Summary</title> <p>Proxy signature allows an original signer to delegate her signing capability to a proxy signer. Recently, to provide lower communication cost and stronger security, Zhang and Yu proposed a short proxy signature scheme in the standard model. They claimed that their scheme simultaneously achieves several merits including strong unforgeability, shorter signature length, and lower computational cost. However, we show that Zhang and Yu's scheme is not as secure as they claimed, because anyone can obtain the actual signing key of proxy signer from three valid proxy signatures. Copyright © 2013 John Wiley &amp; Sons, Ltd.</p> </abstract>