Re: lockit
You obviously dont understand scada systems ! and what they actually do.
Simplified ver ;
The cpu ( usually arm or other) in a nuclear or oil plant is a SIL rated plc or controller,the executing code is self checked and cannot exceed the rated set points and algorithms currently in memory and cpu.
The scada system is the driving (window) or operating platform for the system you are controlling ,with the overarching control of the process in this isntance governed ' completely by the CPU on the plant controllers.
If the cpu coding programme is installed on the scada ( win) machine ,which is a big mistake and often done by plant engineers who dont have any process security then the code could be changed if the running code is not passworded and physically locked,the physical lock on the plant processor stops and write functions to the cpu or memory ,except for the static code that is in operation.
In laymens terms its like you driving a car,you can only push the pedal so far and no more fuel will be injected into the car enginer than what the ecu allows for the air /fuel ratio set by the m/f,for you to push the pedal and extract or inject more fuel you would need to either have a piggy back system ( to emulate false conditions) or have the access code for the existing ecu /cpu so you can recode the m/f setpoints to allow a richer or leaner a/f ratio.
Biting the hand that feeds IT
