Abstract: In recent years, with the extensive application of cloud computing, more and more enterprises, institutions and individuals to start using cloud services, will own data in the cloud. In the same time the rise of cloud services, followed by data security issues by many seriously. Since the data stored in the cloud, resulting in a number of prominent security issues. This paper proposes a platform based on trusted third-party public cloud data security solutions. The program independent trusted third party platform as the core, data encryption, key management, data-aware, data sharing, responsibility for the accident, and so has certain advantages.