verification (cs�div) protocol was proposed. the clients
uploaded files and tags to the servers and then did random
check; the servers returned proofs and the clients judged
the result. this protocol could not only ensure the
integrity of data in the cloud storage effectively, but also
resist the cheat from the un�trusted servers and the attack
from the malicious clients, and then improved the
reliability and stability of the whole cloud storage system.
the simulation experimental results show that the proposed
protocol realizes the protection of data integrity at low
cost of storage, communication and delay.
key words:
cloud storage; data integrity; homomorphic tag; security
protocol; data storage security
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0 引言�
随着计算机网络的不断发展，人们对于数据存储的要求也越来
越高，特别是在云计算兴起的背景下，基于海量数据的云存储系
统成为关注的热点。很多的网络服务商，包括国外的 dropbox 以
及国内的金山快盘等，都开始提供云存储服务，帮助用户实现任
