Physical security An important component in the overall security of a system is the difficulty of physical access for theft or tampering. A rule of thumb is that the electronic and physical security means should present comparable difficulty to would-be attackers, and should have cost commensurate with the value of what is being protected.

Comment on the applicability/usefulness of the following systems for use in ubiquitous small sensor nodes, nodes with cameras, gateways (including those in vehicles), aggregation points, and CAs: tamper-detection devices, hardened casing, security bolts, security port for key updates, camouflage/embedding in structures, secured room, secured facility, and redundant systems.