mechmouse: Most accurate, non-sarcastic portrayal of hacking or using technology for nefarious deeds in a film ever is "The Italian Job (1969)". In order to secure a quick get away they "hack" the computer controlling the traffic lights.
By "hack", they hired a programmer to make an altered version of the code, then tricked their way into the computer room and swapped out the tape reel.
In the nearly 50 years since, no one I'm aware of has ever come that close to a realistic portrayal of hacking.
Matrix Reloaded, Trinity uses a know (but patched by the time the movie came out, but fit with the timeline) SSH vulnerability to get into the power plant.