随着云计算的应用不断拓展，云计算自身也面临着巨大的挑战。本文针对数据访问隔离，提出了具有时态特性的多层次访问控制模型，保证信道中传输的静态数据以及用户下共同使用的数据，具有隔离性、正确性和完整性。%Cloud computing is facing huge challenges itself with the enrichment and extension of cloud applications. This paper aims at the security of data and proposes a multi-level access control model with tense property.It ensures the security of static data transferred in the channel and data commonly used by users and is of great isolation, validity and integrity.
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