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Enterprises protect their internal storage and retrieval process using firewalls and also protect it from insider attacks by formulating secure data access procedures. If the enterprises are willing to store data in cloud, cloud computing service providers have to take care of data privacy and security. A common way to achieve security is encryption/decryption mechanism employed by cloud service providers. However, performing both tasks such as storage and encryption/decryption mechanism by cloud server causes security problems as the administrators know the sensitive information and may involve in illegal practices.
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