基于RBEC的副本动态存储方法

Replica Dynamic Storage Based on RBEC

随着云存储技术的飞速发展,现有的云存储架构和存储模式都以一种静态的方式呈现在用户和攻击者面前,使得数据面临着更多的安全威胁。针对这种数据静态存储模式的不足,文中提出了一种基于二元随机扩展码(RBEC)的副本动态存储方法。该方法利用一种网络编码将数据块存储在云节点上,通过基于二元随机扩展码进行节点数据变换,可随机时变地改变节点的数据信息,通过变换攻击面来增加攻击者实施攻击的复杂度和成本,降低系统的脆弱性曝光和被攻击的概率,提高系统的弹性。理论分析和仿真实验结果表明,该方法对变换时的编码计算时间开销在整个动态变换中的占比不高,主要的时间开销是在节点间数据编码块的传输上。此外,文中还将该方法与一般再生码拟态变换方案做了性能对比分析。REBC的特性,即重新生成的编码矩阵满足MDS性质的概率几乎为1,所以文中所提方法的编码过程的性能开销优于一般再生码可能多次变换的性能开销。

With the rapid development of cloud storage technology,the existing cloud storage architectures and storage patterns are presented in a static way to users and attackers,making the data face more security threats.This paper proposed a duplicate dynamic storage scheme based on Random Binary Extension Code(RBEC).The scheme uses a network code to store the data blocks on the cloud nodes.The data information of the nodes can be changed randomly and time-varying by the node data transformation based on Binary Random Extension Code.By changing the attack surface,it can increase the complexity and cost of the attacker,reduce the vulnerability exposure and the probability of being attacked,and improve the flexibility of the system.The theoretical analysis and simulation results show that the coding computation time cost of this method is not high in the whole dynamic transformation,and its main time cost is the transmission of data encoding blocks between nodes.In addition,the performance of this method was compared with the general regenerative code mimetic transformation schemes.Because of the characteristics of REBC,that is,the probability of the regenerated encoding matrix satisfying the MDS property is almost 1,the performance overhead of this method is better than that of general regenerative code which may transform many times in the encoding process.