中文摘要：

云计算作为一种新的计算模式，可为用户提供低成本的动态计算资源和存储资源，能充分提高资源的使用效率．但是数据隐私安全问题已成为云计算应用普及的最大挑战．为了更好管理用户的隐私数据，在基于（n＋1，t＋1）阈值的基础上，提出了一种基于隐私类型的（n＋1，t＋1）阈值隐私保护模型，结合可信的第三方服务器隔离存储模型，用户可在授权后依据数据隐私类型采用基于角色的访问控制进行相应的访问操作．安全分析表明，基于隐私类型的保护机制在方便用户按类型访问云中的数据资源同时，可以充分地实现用户数据的分类隐私保护．

英文摘要：

Cloud computing, as a new computing model, can provide users with low- cost dynamical computing and storage resources, and enhance the efficient use of resources fully. However, the issues of data＇s privacy security have become the biggest challenge for application and popularity of cloud computing. In order to manage the user＇s private data better, this paper based on （n ＋ 1, t ＋ 1） threshold model, proposed a novel threshold privacy protection model of privacy-types based, combining with an isolated storage model using a trusted third-party. After certification, authorized users can make the appropriate action of their data according to the data privacy-type using role.-based access control. Security analysis shows that the privacy protection mechanism based on privacy-type can make user convenience to access to data resource of the cloud and fully realize the classification privacy protection of users＇ data.