We describe the design and implementation of a public-keyudplatform, secFleck, based on a commodity Trusted Platform Moduleud(TPM) chip that extends the capability of a standard node. Unlikeudprevious software public-key implementations this approach provides E-udCommerce grade security; is computationally fast, energy efficient; andudhas low financial cost — all essential attributes for secure large-scale sen-udsor networks. We describe the secFleck message security services such asudconfidentiality, authenticity and integrity, and present performance re-udsults including computation time, energy consumption and cost. This isudfollowed by examples, built on secFleck, of symmetric key management,udsecure RPC and secure software update.
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