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Privacy is one of the critical concerns that hinders the adoption of public cloud. For simple application, like storage, encryption can be used to protect user's data. But for outsourced data processing, i.e., big data processing with MapReduce framework, there is no satisfying solution. Users have to trust the cloud service providers that they will not leak users' data. We propose adding black boxes to the public cloud for critical computation, which are tamper resistant to mos t adversaries.doi:10.29268/stcc.2014.0009 fatcat:qu7okp7y7jh7dnqfdzigc336gi