服务欺诈

网络中普遍存在着公共悲剧的问题，也存在着大量不可靠的服务以及欺诈行为，严重影响了P2P网络的性能。

Tragedy of Common is very common in the network , and there still exist a lot of unreliable services and malicious actions , which seriously affects the performance of P2P network .

但自组织系统的动态、开放、自治等固有特征使得其面临严重的行为可信问题，具体表现为不可靠服务和欺诈行为、吃白食、资源无节制使用等问题。

The open , dynamic and autonomous nature of the self-organizing systems brings up serious behavior trustworthiness problems , such as unreliable and fraud services , free-riding and resource abusing .

此外，P2P网络中存在着大量不可靠的服务质量以及欺诈行为。

In addition , there still exist a large amount of P2P services with unreliable qualities and malicious actions .

只有合法用户能访问服务（包括拒绝欺诈阴谋）

Only legitimate users can access the services ( including the denial of spoofing schemes )

在信誉的更新算法中结合了在线服务背景特征，如服务价值，评分代理方信誉，并提出惩罚因子，对实施服务欺诈的代理方实施惩罚，以达到对欺诈行为的震摄作用。

Aggregation algorithms of reputation combines with the background characteristics of online services , such as service value , rating agent reputation , and penalty factor to punish and shock fraudulent agent .