Secure File Storage for Android Devices on Public Clouds

We propose MCOFS a secure cloud storage system for Android that combines the use of multiple public cloud providers with cryptography and redundancy mechanisms to ensure the confidentiality and availability of files even if one of the providers becomes hostile or suffers catastrophic data loss. Experimental results show that, while there is a performance penalty in comparison to the plain use of a single provider, it is small enough and a fair price to pay for the added guarantees.