Deduplication - Encrypted Single Instance Data Storage in Community Cloud

Abstract

Subtracting the cost of storage by saving only one replica of similar data is unprecedented with the drastic rise in the magnitude of data that is maintained in the social cloud. For guaranteeing data confidentiality, they are generally encrypted prior to outsourcing. Conventional encryption will invariably provide many different ciphers that are made from the same plain text by different users' secret keys, which can interfere with data exclusion. Combined encryption makes it possible to opt out by simply encrypting the same plain text in the same cipher text. An auxiliary issue is the means of robustly and efficiently managing large number of convex keys. A number of minimization schemes have been proposed to overcome the combined management problem. But, key management servers need to be introduced or communication is necessary among data owners. In this technical work, a new client-end exclusion protocol called KeyDup is designed without using an autonomous key management server using the Advanced Encryption Standard (AES) approach. Users have interaction only with the Cloud Service Provider (CSP) during the times of uploading and downloading the data. Security analysis shows that the KeyDup ensures data confidentiality, simultaneously protecting the integrity of key security and privacy. A rigorous and comprehensive performance comparison reveals that this program makes the best transfer in terms of cost of storage, communication and computational overhead.