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0引言云存储以其低廉的成本、良好的可扩展性和可靠性等优点而广受青睐,已被越来越多的用户所接受,把数据以外包的形式存储在云端,已成为企业存储的一种发展趋势。目前,云存储进一步推广应用的主要阻碍是安全问题,由于数据存放在用户无法掌控的云端,数据的安全过度依赖于并不十分可靠的云服务提供商(Cloud ServiceP rovider,CSP),数据的安全难以得到保障。要解决这一问题通常采用加密存储的方法,即数据拥有者把数据以
0 Introduction Cloud storage is widely favored by its low cost, good scalability and reliability, has been more and more accepted by users, the data is stored in the form of outsourcing in the cloud, has become the enterprise storage A trend of development. At present, the main obstacle to the further promotion and application of cloud storage is the security issue. Because data is stored in a cloud beyond the user’s control, data security relies excessively on less reliable Cloud Service Provider (CSP), data security Difficult to be guaranteed. To solve this problem is usually encrypted storage method, the data owner to the data