A Number-limited Proxy Signature Scheme

There is no valid proxy signature scheme which limits signing times until now.Combining the technique of forward-security signature and a one-time signature scheme,we constructed a proxy signature without TTP which can limit signing times.In the scheme,the proxy key is forward security,every generation refers to s specific signature and the generations time is limited.If the proxy signer wans to use the same proxy key to signature different messages,his private key will be cracked.The scheme's security is based on the difficulty of solving the discrete logarithm problem.