In distributed systems users often need to share sensitive data with other usersbased on the latter's ability to satisfy various policies. In many cases the data ownermay not even know the identities of the data recipients, but deems it crucial that theyare legitimate; i.e., satisfy the policy....

This paper presents a novel coordinated algorithm for distributed state estimation where Phasor Measurement Units (PMUs) measurements are considered at both subsystem level and coordination level. At the coordination level, the linear state estimation with PMUs is carried out to coordinate the...