[peterwwillis]

A locksmith came to let me back into my apartment the other day. He told me that because the front lock was a 'commercial' lock, he'd have to charge me $50 extra. I asked him if he would charge the same if he used the same lock-picking technique on a residential lock (since this was a residence); he said yes. So then I asked him what was so special about a bump key for this lock versus a residential lock, since they're both just blanks cut to five-nines and this lock has no anti-bump pin. He said, nothing special. So I asked him, since the bump key works exactly the same on either lock, why was he charging me an extra $50?

He ended up dropping the extra.

Security is not a Dark Art, and there is no harm in teaching people how or why attacks work. If you can find it at a bookstore or via a Google search, it's safe to disseminate to the general public via blog.