I was in junior high early 90s when I got into trouble with my school's networks. Setup was Novell Netware, DOS 6.x. I was never a Netware expert by any means, but by that time I'd been using DOS at home for quite a number of years and knew my way around pretty well. Anyways, the network crashed. I got accused of causing the crash because a teacher had seen me with "a black screen open", aka a DOS prompt. Our Netware setup didn't allow for direct DOS access; we had a limited set of DOS apps from a menu we could run. Well, among those apps was WordPerfect for DOS. There was some function key combo that'd suspend WordPerfect and dump you at a DOS command prompt (I forget the key combo, but we all had those keyboard templates at the time that listed out the various commands helpfully, right in front of you, at school, even!).

Well, being at a DOS prompt was enough circumstantial evidence for me to get suspended for a week (no FBI record, AFAIK). My parents, despite being strict, were also fair and asked me point blank, "Did you have anything to do with what you're being accused of?". Told them no, I was just at a DOS prompt (probably to play either nibbles or gorillas - those classic BASIC games). To their credit, their opinion was if I was going to serve the time, I might as well know how to do the crime (know, not actually do). I had already been tagging along to continuing education computer classes my mom was attending, but my parents started buying me more and more computer books. It got me started down the programming path. I'd already been pretty friendly with our sysadmin at school and he knew I had nothing to do with what happened and hadn't accused me, but the school needed a scape goat, and I was it. He felt bad for me and choose to help me out with my learning, too, instead of continuing the punishment. He gave me a copy of the software he used for after hours remote access over direct dialup. Think it was called Carbon Copy? It was basically just telnet over dialup that allowed me direct access to his PC on the network after hours before I even knew what telnet was. So, I'd connect after dinner and play around for hours as network admin. It wasn't multiprocessed, so I had to be patient. Typically when I'd log in, he was running a nightly backup manually that he'd kick off before he left for the night. I just had to wait for it to complete, then I could do whatever I wanted. I had full access to the grading/attendance system. I could message teachers as other teachers, etc. I could have granted admin access to anyone, but I was smart enough to never touch my own account, instead, created fake admin users and used those, instead. I'd hide files in plain sight using the ALT+255 trick to embed a nonprintable character in file/directory names. You could see them, you just couldn't directly access them without renaming them for most programs. Fun times. I never did anything destructive, though I could have easily.

Security in the 90s was a joke. They were good times, indeed :)

I continued my shenanigans into college. College was my first encounter with Windows NT networks & l0phtcrack. I remember one night, walking into my dorm room with the SAM file from a lab PC on a floppy. I popped it into my own PC, started cracking the passwords, expecting it to run all night. As I got up from my PC to head down for dinner, I was surprised to see that I'd already cracked the administrator password. It was just a 5 character password that was the building code & room number for campus IT. I already knew better than to do anything from my own PC, only ever worked from different lab PCs in different buildings and under assumed accounts. Never reported anything, either, for fear of reprisal.