Abstract: In oder to achieve the accountability system of cloud platform, retrospect is the primary technology method. Recalling the complete trajectory of the security event in this period,it can be controlled by the ability to trigger and record operations during this period. In order to tackle the challenges of business transparency in cloud system retrospect, the paper reviews the transparency, efficiency and cost of the enterprise. This paper states general retrospect technology based on security label, and establishes an accurate and efficient retrospect technology prototype.

Key words: cloud platform, cloud computing, security label, accountability, retrospect

摘要： 对于云平台问责与追溯，问责是要达成的目的，追溯是技术手段.为达到针对云环境下恶意行为问责的目的，要求追溯技术能够逆向还原从事件发生点到事件发起源头的完整路径，并记录这期间的操作行为.针对业务透明性、追溯机制精度和范围、追溯机制效率和成本等方面面临的挑战，提出一种基于安全标签的通用追溯技术，建立精确高效的追溯技术原型.

关键词: 云平台, 云计算, 安全标签, 问责, 追溯