Before revision:  In this paper, we investigate defending mechanisms against false-data injection attacks . By protecting carefully selected meter measurements and (or) power network topological information, we show that no false-data injection attack can be formulated to compromise any set of state estimates.
After revision:  In this paper, we investigate defending mechanisms against false-data injection attacks on power system state estimation. By securing carefully selected meter measurements and (or) power network topological information, we show that no false-data injection attack can be formulated to compromise any set of state estimates.