信任的理解
信任是一种信仰，是一种主观的mental 态度，对一个人或物的行为和动作（action 和 behavior）和相关result（agent A to another agent B）
信任的特点
主观性 Subjective，完全取决去个人的disposition 和 经历。
Optimistic person, is easy to trust, and difficult to distrust
Pessimistic person, is hard to trust, and easy to distruct
转递性 Transitivity
A相信B，B相信C，就是A相信C
Context dependent and multi-faceted
Context dependent, different situation the trust for something is different.
Dynamics
信任会随着时间的推移，增加或是减少
Trust Acquisition 获取信任
信任可以从个人经历获得， could gain trust from personal experiences
- 直接互动 Direct interaction
- 观察 Observation
- 推算 Presumptions
信任可以从他人获得
- Word from others (流言蜚语，八卦，口口相传)
- institutions （机构）
声誉
是一群人对于agent的信任或是评价
Centralized person/agent reputation systems
特点是比较简单
reputation 来自于不同用户的总体评级
有centralized system manager, to keep of trust and reputation
Decentralized person/agent reputation systems
没有centralized system manager, to keep of trust and reputation
reputation需要通过自己来建立， Each agent has to develop the reputation on other agents based on direct interactions.
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