The world of locks is one in which, so very often, things old become new again. Master-keyed lock systems fall into this category. For years now, many people have shared advice and stories regarding methods of attacking master-keyed systems. This year, at HOPE Number Nine, The Open Organisation Of Lockpickers will be running a contest in which attendees may attempt to decode a master-keyed system during the weekend. If you stop by this presentation, you'll be a few steps ahead of everyone else who is attempting this interesting and different lockpicking game at HOPE Number Nine - and you'll learn about how master-keyed systems are often vulnerable to many surreptitious attacks.