A New Kind of Self-Certified Proxy Digital Signature Scheme

A new proxy digital signature scheme based on the elliptic curve crypto system was developed to solve the problems such as the low work efficiency and the weak in delegation authority control, which are existing in the known proxy signature schemes. The new scheme combined the warrant with the identity information of the original signer and the proxy signer through importing the idea of public key self-certified system and can finish all the verifying operations such as the identity authentication to the original signer and the proxy signer, the confirmation about the warrant, and the verification for the proxy signature can be finished in one step without the help from the trusted certification authority server. The analysis shows that the proposed scheme has the ability to control the scope of delegation reliably, resist the known attacks and prevent the abuse of proxy digital signature power. It has higher working efficiency, lower communication bandwidth, less operation expense, stronger security and better in reliability.