Hobby groups throughout North America have cracked supposedly unbeatable locks. Mr. Nekrep, who maintains a personal collection of more than 300 locks, has demonstrated online how to open a Kensington laptop lock using Scotch tape and a Post-it note. Another Lockpicking101.com member discovered the well-publicized method of opening Kryptonite bike locks with a ball-point pen, a revelation that prompted Kryptonite to replace all of its compromised locks. Other lock manufacturers haven't admitted their flaws so readily. Marc Tobias, a lawyer and security expert, recently shook up the lock-picking community by publishing a detailed analysis of how to crack the uncrackable: Medeco locks. "We've figured out how to break them in as little as 30 seconds," he said. "[Medeco] won't admit it, though. They still believe in security through obscurity. But by not fixing the problems we identify, lock-makers are putting the public at risk. They have a duty to disclose vulnerabilities. If they don't, we will."