Abstract
"Unobtrusiveness" is the essential property of ubiquitous computing.We presented a Security Protocol for Ubiquitous Environments(SPUE),which provided data authentication,and data freshness besides unobtrusiveness.Using both asymmetric-key and symmetric-key algorithms made the protocol more secure and enough for severe resource constraints,limited computation,memory,and communication capacities.Furthermore,with modeling the protocol by Communicating Sequential Processes(CSP) method and checking it with Failures Divergence's Refinement(FDR),it has been verified that security properties can be guaranteed.
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