Originally Posted By: DWallach
Apple does some clever tricks, like artificially slowing down the guess rate if you have enough failed attempts.


I don't consider this a "clever trick", I consider it to be a standard baseline level of security that all password and PIN systems should implement in order to be considered useful at all. Any password or PIN system that doesn't implement this is completely insufficient, and I am aghast any time that I see one which gets defeated because the slowdown wasn't implemented.
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Tony Fabris