全生命周期的云外包数据安全审计协议

海量数据的产生给用户带来了极大的存储和计算负担，云服务器的出现很好地解决了这一问题，但数据外包给用户带来便利的同时，也引起了一些的安全问题。针对数据在外包过程中的安全性问题，结合经典的字符串相等检测协议和基于等级的默克尔哈希树（RMHT）算法，设计并实现了一种理论更简化、效率更高的全生命周期的云外包数据安全审计协议。该协议不仅可以保证外包存储数据的完整性，用户可以定期对数据的完整性进行审计；而且可以保证数据的安全迁移；此外，还可以防止恶意的云服务器保留迁移数据的副本，更好地保护用户的隐私。安全性分析和效率分析显示，该协议足够安全并较为高效，外包数据在整个生命周期的安全性将得到较好的保护。

Cloud outsourcing data secure auditing protocol throughout whole lifecycle

The generation of massive data brings a huge storage and computational burden to users, and the emergence of cloud servers solves this problem well. However, data outsourcing brings convenience to users while it also causes some security problems. In order to solve the security problem of data in the outsourcing process, a simpler and more efficient cloud outsourcing data security auditing protocol throughout whole lifecycle was designed and implemented, which was combined with classical distributed string equality checking protocol and Rank-based Merkel Hash Tree (RMHT) algorithm. The protocol not only can protect the integrity of outsourced storage data, allowing users periodically audit its integrity, but also can guarantee the secure transfer of cloud data. Besides, the copy of transfer data can avoid being reserved by malicious cloud servers, protecting users' privacy well. The analyses of security and efficiency show that the proposed protocol is sufficiently secure and comparatively efficient, the security of outsourcing data throughout its whole lifecycle will be protected well.