48 Handbook of SCADA/Control Systems Security
knowledge in exquisite detail that very few besides another engineer would know.
Turning things on and off rapidly may make a signicant mess and some down-time,
but it usually does not cause a process to collapse catastrophically.
Security theory assumes information transfers without any sort of friction. That is
not exactly true. While data can move that fast, the context and education to use that
information do not convey so easily. The reality is that while obscurity is not security, it
does represent a signicant obstacle that may tip priorities from one aspect to another.
Thus, although an exposed HMI interface having an obscure back-door password
is a bad thing, a dial-up modem with access ...