3. PROBLEM DEFINITIONIn cloud computing, all the user data are stored in the cloud resources. The results aredistributed to the user through the network when they needed.
Most of the industrial data storedin cloud computing, but cannot predict all stored data must have secured, hence most of clouddata are encrypted. Even more encryption algorithm invented, sensitive information can leak ifthat one key is leaked so, less secure. Most of the encryption key is managed by cloud providers,so providers may break all information. This can bring considerable economic loss or severesocial reputation impairment to data owners.As such, sharing or releasing privacy-sensitive data sets to third-parties in cloud willbring about potential privacy concerns, and therefore requires strong privacy preservation.
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Theproblems identified from the existing approaches are analyzed for privacy preserving andscalability. Some importance will gave to the local recoding technique for the record linkageattacks over the data sets.