In view of the collusion attack in cloud computing data location verification

collusion-attack-defensive data location verification protocols are proposed.Firstly

the system model of data location verification is given and the security threats are analyzed and the security definition is formalized.Then

the security positioning protocol is combined with the provable data possession protocol and the data location verification protocol in one dimension is proposed.In addition

the proposed protocol is proved to satisfy the security definition and to defend collusion attack.Based on the proposed protocol

the data location verification protocol in three dimensions is constructed.Finally

in three dimensions

the proposed protocol is tested and compared with the Lost protocol and the Geoproof protocol.The results show the proposed protocol can verify the specific geographical location of the server and can defend collusion attack of the adversaries.