Computer Engineering and Applications ›› 2012, Vol. 48 ›› Issue (1): 125-127.

• 网络、通信、安全 • Previous Articles     Next Articles

Cryptanalysis and improvement of threshold signcryption scheme

WANG Yongbing   

  1. Nationalities College, Hebei Normal University, Shijiazhuang 050091, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-01-01 Published:2012-01-01



  1. 河北师范大学 附属民族学院,石家庄 050091

Abstract: Through the cryptanalysis of a generalized group-oriented threshold signcryption scheme, it is found that the scheme can not resist conspiracy attack, and KDC can forge valid threshold signcryption at random. It is not provided with semantic security. The third party can decrypt signcryption. An improved scheme is proposed, which overcomes the security drawbacks and retains the merits of the original scheme.

Key words: threshold signcryption, forgery attack, conspiratorial attack

摘要: 对一种面向群组通信的通用门限签密方案(P-L-L方案)进行密码分析,发现该方案容易遭受合谋攻击,并且密钥分配中心可以任意伪造有效的门限签密,不具有语义安全性。提出了一种改进方案,新方案克服了P-L-L方案的安全漏洞,可以有效抵抗合谋攻击和伪造攻击。

关键词: 门限签密, 伪造攻击, 合谋攻击