Re: Only cracking I have done is
Old-style D-locks had a type of circular lock that was very vulnerable to being picked using a circle of plastic like, say, the cap of a Bic ballpoint pen. I'm not giving any trade secrets away here, since this quick pick system has been around for decades.
Masterlock however is something of a concern. They have an unenviable reputation as the absolute easiest-to-pick padlock makers in the world, barring some of the cheap and useless Chinese brands. Masterlock use no security pins, and even go so far as to include a vulnerability in some padlocks that leads to them being easily bypassed.
Their latest outing into the world of security done wrong is a Bluetooth padlock with the key hardcoded into the device MAC address...