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Tisa: Toward Trustworthy Services in a Service-Oriented Architecture
October-December 2008 (vol. 1 no. 4)
pp. 201-213
Hridesh Rajan, Iowa State University, Ames
Mahantesh Hosamani, Iowa State University, Ames
Verifying whether a service implementation is conforming to its service-level agreements is important to inspire confidence in services in a service-oriented architecture (SoA). Functional agreements can be checked by observing the published interface of the service, but other agreements that are more non-functional in nature, are often verified by deploying a monitor that observes the execution of the service implementation. A problem is that such a monitor must execute in an untrusted environment. Thus, integrity of the results reported by such a monitor crucially depends on its integrity. We contribute an extension of the traditional SoA, based on hardware-based root of trust, that allows clients, brokers and providers to negotiate and validate the integrity of a requirements monitor executing in an untrusted environment. We make two basic claims: first, that it is feasible to realize our approach using existing hardware and software solutions, and second, that integrity verification can be done at a relatively small overhead. To evaluate feasibility, we have realized our approach using current software and hardware solutions. To measure overhead, we have conducted a case study using a collection of web service implementations available with Apache Axis implementation.

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Index Terms:
Assertion checkers, assertion languages, performance, Verification, Monitors, Domain-specific architectures, Validation
Citation:
Hridesh Rajan, Mahantesh Hosamani, "Tisa: Toward Trustworthy Services in a Service-Oriented Architecture," IEEE Transactions on Services Computing, vol. 1, no. 4, pp. 201-213, Oct.-Dec. 2008, doi:10.1109/TSC.2008.18
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