Paper 2003/263

Security Analysis of Lal and Awasthi's Proxy Signature Schemes

Manik Lal Das and Ashutosh Saxena and V P Gulati

Abstract

In this paper, we analyze two proxy signatures scheme [1], [2] proposed by Lal and Awasthi and found that both the schemes suffer with the security flaws. The scheme [1] suffers with proxy signer's forgery attacks and misuse of original signer's delegated information. The other scheme [2] suffers with original signer's forgery attack, proxy signer's undeniability and misuse of delegated information.