Novel data storage and retrieval in cloud database by using frequent access node encryption

摘要

Cloud computing has the advantage that it offers companies unlimited data storage at attractive costs. However, it also introduces new challenges for protecting the confidentiality of the data, and the access to the data. Sensitive data like medical records, business or governmental data cannot be stored unencrypted on the cloud. Moreover, they can be of interest to many users and different policies could apply to each. Companies need new mechanisms to query the encrypted data without revealing anything to the cloud server, and to enforce access policies to the data. Current security schemes do not allow complex encrypted queries over encrypted data in a multi-user setting. Instead, they are limited to keyword searches. Moreover, current solutions assume that all users have the same access rights to the data. This paper shows the implementation of a scheme that allows making SQL-like queries on encrypted databases in a multi-user setting, while at the same time allowing the database owner to assign different access rights to users.we address these issues by combining cloud computing technologies and Attribute Based Encryption for Secure storage and efficient retrieval of Data from the Databases. Here the Attribute is the Frequent access Node in the database which can be Encrypted for Secure Storage and Retrieval. Using database encryption to protect data in some situations where access control is not solely enough is inevitable. Database encryption provides an additional layer of protection to conventional access control techniques. It prevents unauthorized users, including intruders breaking into a network, from viewing the sensitive data. As a result data keeps protected even in the incident that database is successfully attacked or stolen. However, data encryption and decryption process result in database performance degradation. In the situation where all the information is stored in encrypted form, one cannot make the selection on the database content any more- Data should be decrypted first, so an unwilling tradeoff between the security and the performance is normally forced. We present our approach for a multi-level threshold attribute based encryption scheme whose cipher text size depends only on the size of the policy and is independent of the number of attributes. The attribute can be taken as the Very frequent Accessing Node in the Database.