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.