一种基于LT码的数据云存储方案

拜占庭失效或恶意攻击会降低云服务供应商的云存储服务可靠性,为此,提出一种基于云计算的安全可靠数据存储方案。通过LT编码增加分布式云服务器的数据冗余度,在保证性能全局准最优的同时,提升数据用户在数据检索阶段的解码效率。利用支持公共数据完整性检查和准确数据修复,避免数据拥有者长期保持在线状态,并设计数据修复解决方案,使服务运行期间无需产生元数据也能进行数据修复。实验结果表明,与基于网络编码和基于RS码的云存储方案相比,该方案的通信成本只增加了15%,但数据检索效率却提高了约1倍。

A Data Cloud Storage Scheme Based on LT Code

To figure out the solution of the low reliability of cloud storage service caused by the Byzantine failures or malicious attacks, a secure and reliable cloud storage scheme is designed which enhances the reliability with near-optimal overall performance, To enable efficient decoding for data users in the data retrieval procedure, this paper adopts a LT codes for adding data redundancy in distributed cloud servers. In addition, the data owner from the burden of being online is released by enabling public data integrity check and employing exact repair. Furthermore, this paper proposes an exact repairing solution so that no meta data needs to be generated on the fly for repaired data. Experimental results show that the proposed scheme remarkably doubles the efficiency of data retrieval while only adding cost by 15%, compared with the existing cloud storage solutions.