It was on after school. Don't know what channel but one of the core ones. Around 15-20 years ago.
There was this older guy who was clearly for evil deeds. He made all the smart kids (around 16 years old if I can recall) work on cracking a code. Essentially they all sat on computers constantly entering passwords. Eventually a lad found the password, but I can't remember if he told the boss he cracked it, or him and his friend (a girl) kept the information from him.
That's all I remember 😬 go!