Abstract
Cloud computing is a popular technology which permits storing and accessing data over Internet instead of storing it on local machine's hard drive. Cloud enables users to store their data on cloud without fearing about its accuracy and reliability. However storing data on cloud imposes certain security challenges. Outsourcing data in cloud result in data owners losing physical control over their data. Certain Cloud Service Providers (CSPs) may operate dishonestly with the cloud users' data, they may sneak the data from cloud and sell it to third parties in order to earn profit. Thus even though outsourcing data on cloud is inexpensive and reduces long duration storage and maintenance complexity, there is least assurance of data integrity, privacy, security and availability on cloud servers. A number of solutions have been recommended to solve the security issues in cloud. This paper focuses on the integrity verification strategy for outsourced data. The proposed scheme combines the encrypting mechanism along with integrity verification strategy. The encrypting scheme used here is public key cryptographic algorithm like ElGamal and SHA-256 hash function is employed for ensuring data storage correctness on untrusted server.
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