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Master Key Copying Revealed
The attack described by Mr. Blaze, which is known by some locksmiths, leaves no evidence of tampering. It can be used without resorting to removing the lock and taking it apart or other suspicious behavior that can give away ordinary lock pickers.
All that is needed, Mr. Blaze wrote, is access to a key and to the lock that it opens, as well as a small number of uncut key blanks and a tool to cut them to the proper shape. No special skills or tools are required; key-cutting machines costing hundreds of dollars apiece make the task easier, but the same results can be achieved with a simple metal file.
After testing the technique repeatedly against the hardware from major lock companies, Mr. Blaze wrote, "it required only a few minutes to carry out, even when using a file to cut the keys." ...