I did the same thing at my school but it was a brand new SMT magnet school so we showed the net admins and helped to prevent it... Zipslack (first 100mb linux distro) with l0phtcrack was part of my EDC. I believe the first time it was shown to the adults was after someone locked the school network admin out of everything so we helped him recover. We even set up a security lab for the admin team. The next year anything that looked like hacking was grounds for expulsion which lead to a lot more problems with it if you ask me. The school with a wing full of hackers wasn't gonna quit looking at new tools. The school just decided it was like teen sex or smoking. Banned! Lol.