OGPADSM2: oriented-group public auditing for data sharing with multi-user modification
OGPADSM2: oriented-group public auditing for data sharing with multi-user modification
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DOI：
10.1504/ijhpcn.2017.10005146
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Jianhong Zhang;Xubing Zhao;Weina Zhen
中科院分区：
文献类型：
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作者：
Jianhong Zhang;Xubing Zhao;Weina Zhen
在大多数云存储数据共享协议中，为了更新外包的数据，数据更新操作仅由数据所有者执行。显然，由于数据所有者的巨大计算成本，这是远远不实用的。到目前为止，有几种协议允许多个云用户更新具有完整性保证的外包数据。而且这些协议没有考虑行为不端的云服务器与被撤销用户之间的合谋攻击，这是数据共享协议中的一个重要挑战。为了支持多用户修改和抵抗合谋攻击，提出了一种新的支持多用户修改的数据共享公共审计方案。我们的方案不支持公开检查和有效的用户撤销，但提供了后向安全性。同时，我们的方案在双线性Diffie-Hellman问题下是可证明安全的。为了提高审计人员的验证效率，提出了一种改进的验证协议。在改进的协议中，在审计者的验证阶段只需要一次配对操作。与其他协议相比，该方案具有较低的审计者计算量和较强的安全性。
In most data sharing protocols for cloud storage, to update the outsourced data, the data updating operation is only executed by data owner. Obviously, it is far from practical owing to the tremendous computational cost on data owner. Until now, there are a few protocols in which multiple cloud users are allowed to update the outsourced data with integrity assurance. And these protocols do not consider collusion attack between misbehaving cloud servers and the revoked users, which is an important challenge in data sharing protocol. To support multi-user modification and resist collusion attack, we propose a novel public auditing for data sharing with multi-user modification in this paper. Our scheme does not support public checking and efficient user revocation, but provides backward security. At the same time, our scheme is provably secure under the bilinear Diffie-Hellman problem. To increase efficiency of the auditor's verification, an improved protocol is given. In the improved protocol, only one pairing operation is required in the auditor's verification phase. By comparison with the other protocols, our scheme has lower computation cost on the auditor and stronger security.