一个改进的基于身份具有消息恢复功能代理签名方案

An improved ID-based proxy signature scheme with message recovery

在具有消息恢复功能签名方案中,原始信息被包含在签名中,其不需要发送给验证者,因此降低了签名的长度。Singh和Verma提出了一个具有消息恢复功能的基于身份的代理签名方案,Niu等人指出了其方案是不安全的,然后给出了一个改进方案,并宣称改进方案是安全的。然而通过对Niu等人给出方案的分析,发现其方案依然是不安全的,当攻击者获得一个有效签名时,他可以对任何一个消息进行伪造签名。为了解决该方案的安全缺陷,对其方案进行了改进,改进的方案可以有效抵抗伪造攻击。与之前的方案相比,效率更高。

A digital signature scheme with message recovery is a signature scheme in which the original message of the signature is not required to be transmitted together with the signature,so it can reduce the length of the signature. Singh and Verma proposes a new ID-based proxy signature scheme with message recovery. Niu et al. pointed out the scheme was unsafe,and proposed an improved scheme, and announced the improved scheme is safe. The scheme was found insecure through the analysis,the attacker can give a forgery signature when he gets a valid signature. In order to overcome the weakness of the scheme,an improved scheme was proposed,which can resist the forgery attack. Compared with the previous schemes,the improved scheme is more efficient.