The Study Of Distributed Fault Tolerant Digital Sign System Based On P2P Network And Its Application

With more and more important the internet security becomes, Digital Sign technology iswidely used because it can authenticate person on internet. Then more secure study on how tokeep the private key safe today.We study the fault tolerant scheme, and refer to other fault tolerance systems. By usingthreshold cryptography and proactive fault tolerant scheme, we design a distributed faulttolerant digital sign system based on P2P network (PDDSS) .The advantage of PDDSS system is as follow: Using verified secret share (VSS), proactive secret share (PSS) and sub-sign verifiedscheme together, ensure the system can safely running on the P2P network, keepprivate key safe and system security. The system has grouped structure, each group will not affect other group whensigning, key updating and renewing the share server. The combiner server only need less computing amount, main computing amount iseffective separated to many share servers. By using lot of peers as share server, avoid high cost to buy sign-server. Avoid network congestion caused by the center-service, each share server only needless bandwides. And it is difficult to do DDOS attack. P2P network has lots spare peers,the system can renew or add new server easily.This paper analysis system's security and usefulness, and experiment PDDSS on a DigitalRight Management (DRM) system. It shows that: Face with the dormant fault, the system has (n, t) threshold security and usefulness. Face with usual mode of attack, system can also keep security. When the private key length is 512bit and 1024bit,PDDSS only has 11%-33% slowerthan the single sign-server on sign speed. It can ensure the realtime usefulness of thesystem. By using proactive fault tolerant protocol, system can find the malicious server andrenew it.