Research On DRM Model In P2P Enviorenment

P2P networks make the network model from centralized pattern to distributed, let the core of web application from server to each node of network, which create an epoch of network age. P2P networks have no center server, no fixed network topology structure and limitation of the network scale, every node in the network has a high autonomy and liberty, it can join in or drop out the network at any moment and can implement anonymous information exchange among nodes, which makes the P2P system has a lot of security problem. Compare to traditional C/S model, the coryright problem of the P2P network seems even more serious.At present, the DRM model under P2P environment is quite faultiness, a large number of the improve of DRM model still can not get rid of the thrid party validate setting, it can't get out of the format of C/S model. DRM model which based on P2P trust model gives a new train of thought: fault-tolerant thought based on K-order threshold scheme, use trust model to choose identity validate node to deposit private key share. Because of the faultiness of trust model itself and huge use cost, this paper puts forward a DRM model based on friend peer, use the thought of K-order threshold scheme fault-tolerant to dispense private key, choose friend peer and put private key share on it. Compare to the use of trust model, it aims at resource release node to calculate its friend peer, which consequently at a large extent reduce the time complexity and information transfer quantity in the network.No matter the DRM model based on trust model or the DRM model based on friend peer, both of them use the degree of friendship from the resource release node to choose node to identity validate, which is obviously deficiency in the open and autonomy P2P work. Therefor, this paper put forword a DRM model based on contract-net model as well, which uses the improved contract-net protocol to let the resource release node and choose the better participant to put private key share. It emphasizes the requirement in aspects of useableness, credit, friendship and price of the identity authenticate node, the credit and halness of the chosed node are guaranteed, ensures the authentication process accomplished more successfully.