Forward-Secure Proxy Signature Scheme Based on Discrete Logarithm

On the basis of forward-security and the theory of digital signature,a forward-secure proxy signature scheme was presented.The security of the scheme relies on difficuty of solving discrete logarithm problem in a finite range.The effective period is divided into T periods.The key of each period is different because of key evolution algorithm.Even if an adversary has gotten the current signer's key,previous generated proxy signature remains still valid.