This paper presents an approach to protect data stored on remote server. In Grid computing, data may be stored on remote server that contributes to provide its storage resource. But this status challenges the security of data. In order to assure confidentiality and integrity of data stored in remote server, CKFS is proposed in this paper. In CKFS, client can trust its data stored on untrusted server, and intruder will no longer be able to understand data and tampering with data by compromising server. Design of CKFS mainly focuses on giving better solution to integrity verification of a mass of data. By verify integrity of each data block individually and encrypting each data block with different random secret key, it provides better confidentiality and very efficient integrity protection, including resistance against replay attack.
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