Design and Evaluation for a Multi-cloud Based Storage System with Privacy Preserving

We present a multi-cloud based storage architecture that can effectively protect users´ privacy and data security by implementing the concept of Oblivious RAM in a logical layer. It allows users to conceal the reading/writing operation types and access sequences to remote cloud storage in order to prevent the leakage of access patterns, which is a considerable threat to data security. We also use an anonymity preserving mechanism to make it more difficult to track users´ data or confirm users´ identities. Theoretical analysis and experimental results show that our architecture provides a secure and anonymous way to use untrusted cloud storages with high performance and reliability.