Research And Design Of Secure File Transmission Systems Based On P2P

With the development of information technology, P2P model become the focus of researches and attentions. Every node in a P2P system is responsible of the client role and the server one. P2P technology make the number of information and the cost of resource was assigned to each user, so-called marginalize trend. The trend is a challenge to the integrality of distributed system on the action manage and the resource distribute. The authentication of user identity is difficult, and could not use the additional mechanism, so we need use an especial way to design a security system that ensure the proper control and the flexible manage.PKI is a kind of important technology in network security which is the basic framework of secure service. The aim of PKI that construct the trust relationship, and use digital certificate that identify a unique user from others. The digital certificate is composed of the identity of user, the public key of user and the signature of CA, and it ensure that the integrality, confidentiality and undeniableness of digital transmit.The thesis integrated the PKI into the P2P network, implement the authentication of user identity using the digital certificate. Because of the characteristic of P2P network, the traditional PKI model couldn't adapted itself to the P2P network. In this paper, each node can issue the certificate an validate it in P2P network, and implement the put or get of certificate using a hybrid DHT lookup technique. It proposes an identity authentication method that based on multiple certificate paths in distributed trust model. The authentication results achieved along some independent paths incorporating with policies can be used to deduce the trustworthy about target entity, which increases assurance in authentication. It proposes an identity authentication method that based on hybrid certificate paths in distributed trust model. The authentication results achieved along some independent paths incorporating with policies can be used to deduce the trustworthy about target entity, which increases assurance in authentication。Key technique points and methods are described for how to realize such a Secure File Transmission Systems Based on P2P.