“沙发漫游”是一种经济的旅游方式，可以通过一个庞大的关系网免费或者用尽量低的费用在旅游目的地过夜。
Couch surfing is traveling on a budget and using a broad network of contacts in order to get overnight accommodation for free or at as little cost as possible.
并在基于漫游证书认证系统的基础上增加了信任管理，解决安全系统中日益复杂的信任关系管理问题。
The paper designs the roaming certificate system, enhances the management of trust relationship and settles the increasing complex trust relationship management problems.
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