中文摘要：

为了缓解P2P环境下信任缺失、抑制恶意节点攻击，降低不可靠服务风险，通过扩展J？sang主观逻辑思想，提出了一种新的P2P信任模型—ESLTrust。为更精确地描述信任关系的复杂性，采用肯定信任值和否定信任值取代J？sang主观逻辑中肯定事件数和否定事件数，并引入时间衰减因子和风险值，计算得到节点信任度。仿真实验与分析表明，该模型使节点的信任度受恶意行为的影响更灵敏，可有效增强对恶意节点的抵御能力，提高系统交互成功比例。

英文摘要：

In order to relive the loss of confidence,inhibit the attack of malicious nodes and reduce the risk of unreliable services,a novel trust model for P2P is presented.To descript the complexity of the trust relationships more accurately,the paper adopts affirmative and negative trust value to replace the number of affirmative and negative events which is used in J？sang’s subjective logic and the paper has introduced the factor of time decay and the risk value to compute the trust value of nodes.The analysis and the results of simulation indicate that the model makes the normal nodes’ reflection to malicious behavior more sensitive and it can enhance the ability of resistance to malicious behavior and improve the rate of successful transaction greatly.