In offshore plant, the process control system manages process variables and interfaces with all plant utilities. It consists of workstations, controllers and various field interface devices. Plant operators deal with a large variety of process variables using the Human-Machine Interface application (HMI) in operator stations, which is a software program to interact with plant operators and to c...

Byzantine-fault-tolerant service protocols like Q/U and FaB Paxos that optimistically order requests can provide increased efficiency and fault scalability. However, these protocols require n ≥ 5b + 1 servers (where b is the maximum number of faults tolerated), owing to their use of opaque Byzantine quorum systems; this is 2b more servers than required by some non-optimistic protocols. In this ...

A considerable and growing fraction of servers, especially of web servers, is hosted in compute clouds. In this paper we opportunistically leverage this trend to improve privacy of clients from network attackers residing between the clients and the cloud: We design a system that can be deployed by the cloud operator to prevent a network adversary from determining which of the cloud’s tenant ser...