Abstract: E-mail security scanning software is being widely used. With the rapid increase of user number and system flow, there are insurmountable problems in terms of performance, robustness, maintainability and scalability in the traditional tightly-coupled and synchronous IMHS (Inter-scan Message Hosted Security) system. With regards to the system bottleneck by the mass users, a loosely-coupled, asynchronous, stateless principle was proposed for system design. Through the integration of cloud computing and Service Oriented Architecture (SOA) technique, a P2P-based E-mail secure cloud service system was designed and implemented. The system supports dynamic collaborative process, and effectively improves the efficiency of resource use and system scalability. The results and analysis of typical operation tests in real system verify the feasibility and effectiveness of the system architecture.

Key words: cloud computing, E-mail security service, Service Oriented Architecture (SOA), Peer-to-Peer (P2P), REpresentational State Transfer (REST)

摘要： 目前电子邮件安全扫描软件正在被广泛使用，随着用户数量和系统流量的激增，传统的紧耦合同步处理IMHS系统整体效能、健壮性、可维护性、可扩充性上都存在着难以克服的问题。针对海量用户压力之下存在的系统瓶颈，确立了以“松耦合、异步、无状态”为设计原则，通过融合云计算及面向服务体系结构(SOA)技术，设计并实现了一个基于P2P协同的对等化电子邮件安全云服务系统。该系统支持服务过程动态协同，有效提高了资源使用效率和系统可伸缩性。最后在实际系统中通过典型操作实例测试分析了系统性能，验证了系统架构的可行性和有效性。

关键词: 云计算, 电子邮件安全服务, 面向服务体系结构, 对等网络, 表述性状态转移