Z'code:一种新的云数据精确修复方法

Z' code: new method for cloud data precision repair

由于云存储中用户对数据失去了控制,所以云存储存在低可用性和隐私泄露等严重的安全问题。为提高数据可用性,根据已有的冗余技术——Z code,提出Z'code,一个新的云数据精确修复方案。首先对数据进行隐藏与编码,再将编码数据在多个云上进行分布存储。通过实验和分析,Z'code修复一块隐藏数据块所花费的时间与Z code相差无几,而修复一块冗余块的时间比它们修复数据块的时间都要少。一方面,它能够保证数据隐私;另一方面,它能精确修复任意两个丢失数据块,进一步提高了数据可用性。

Because users lose control of the data stored in the cloud storage,there are serious security issues with cloud storage.Such as low availability and privacy leaks.To improve data availability,according to the existing redundant technology--Z code,this paper proposed the Z′code,that a new method for precisely repairing cloud data accurate repair.At first,it hided and encodes data.Then,it stored the encoded data on multiple clouds.Experiments and analysis show that,the time Z′code takes to repair the a hidden data blocks is almost the same as that of the Z code and the time it to repair the a redundant blocks is smaller than the time they are to repair the data blocks.on the one hand,it can guarantee data privacy;on the other hand,it can accurately repair any two missing data blocks and it further improve the data availability.