Aiming at preventing user data leakage and the damage that is caused by co-resident attacks in the cloud environment, a data partitioning and encryption backup (P&XE) scheme is proposed. After the data have been divided into blocks, the data are backed up using the XOR operation between the data. Then, the backup data are encrypted using a random string. Compared with the existing scheme, the proposed scheme resolves the conflict between data security and survivability via encrypted backup. At the same time, because the XOR-encrypted backup causes multiple data blocks to share the same backup data, the storage overhead of the user is reduced. In this paper, existing probabilistic models are used to compare the performances of an existing scheme and the P&XE scheme in terms of data security, data survivability and user storage overhead, and the overall performances of the two schemes in terms of these three aspects that are compared using control variables. Finally, the experimental results demonstrate the effectiveness of the P&XE scheme at improving user data security and survivability and reducing user storage overhead.

中文翻译：

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低成本的数据分区和加密备份方案，可抵御同居攻击

为了防止用户数据泄漏以及云环境中的共存攻击所造成的破坏，提出了一种数据分区和加密备份（P＆XE）方案。在将数据划分为块之后，使用数据之间的XOR操作来备份数据。然后，使用随机字符串对备份数据进行加密。与现有方案相比，该方案通过加密备份解决了数据安全性与生存性之间的矛盾。同时，由于XOR加密的备份导致多个数据块共享同一备份数据，因此减少了用户的存储开销。在本文中，使用现有的概率模型从数据安全性，数据可生存性和用户存储开销方面比较现有方案和P＆XE方案的性能，以及在使用控制变量进行比较的这三个方面，两种方案的整体性能。最后，实验结果证明了P＆XE方案在提高用户数据安全性和可生存性以及减少用户存储开销方面的有效性。