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Mathematical Problems in Engineering
Volume 2013, Article ID 761694, 4 pages
Research Article

On the Security of a Certificateless Proxy Signature Scheme with Message Recovery

1Department of Electronic Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
2School of Mathematics and Statistics, Wuhan University, Wuhan, Hubei 430072, China
3National Key Laboratory of Mechatronic Engineering and Control, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China

Received 19 January 2013; Accepted 5 April 2013

Academic Editor: Wanquan Liu

Copyright © 2013 Wenbo Shi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A proxy signature scheme allows a proxy signer to sign messages on behalf of an original signer within a given context. It has lots of practical applications in distributed systems, grid computing, mobile agent applications, distributed shared object systems, global distribution networks, and mobile communications. Recently, Padhye et al. proposed a certificateless proxy signature scheme with message recovery and claimed the scheme is secure against both of the two types of adversaries. However, in this paper, we will show that Padhye et al.’s scheme is not secure against the Type I adversary. The analysis shows their scheme is not secure for practical applications.