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Web services and service oriented architectures are becoming the de facto standard for Internet computing. A main problem faced by users of such services is how to ensure that the service code is trusted. While methods that guarantee trusted service code execution before starting a client-service transaction exist, there is no solution for extending this assurance to the entire lifetime of the transaction. This paper presents Satem, a Service-aware trusted execution monitor that guarantees the trustworthiness of the service code across a whole transaction.
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