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Browsing by Author "Oflaz, Mahmut"

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    Master Thesis
    Cloud storage security and crud supported data possession with integrity auditor
    (2016) Oflaz, Mahmut
    Cloud and cloud security are becoming more important while cloud technology is changing our lives in many ways.Because of data breaches, user and companies worry about migrating to cloud systems. When a client store data at untrusted server, verifying that the server possesses the original data is a challenging problem. Substantial portion of data possession offering focus on performance rather than security of the system. In this thesis, privacy focused data possession model has been offered; which is balanced form of increased privacy and performance. A trusted party, an auditor, has been added to the system, which verifies the integrity of the data while preserving the privacy of the data on the cloud. Thereby, this auditor takes the burden from cloud user by delegating the user. In long term, integrity auditors can audit cloud systems by standardizing equivalent services which offered by clouds. In most cases, cloud users want to update/modify the stored data. The proposed data possession implementation supports modifying data, which has been stored on cloud. To measure the effects of the system parameters and general performance of the system, a test bad has been created which includes cloud user, cloud and integrity auditor. Experiments have been conducted to compare the proposal approach with the previous works to evaluate the cost of putting third party integrity auditor in the system, tests on encrypted data with different block and file sizes have been carried out.