On the (limited) power of non-equivocation
Allen Clement, Flavio Junqueira, Aniket Kate, Rodrigo Rodrigues · 2012
In recent years, there have been a few proposals to add a small amount of trusted hardware at each replica in a Byzantine fault tolerant system to cut back replication factors. These trusted components eliminate the ability for a Byzantine node to perform equivocation, which intuitively means making conflicting statements to different processes.