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Microsoft undertook the study to gauge how effectively frequent password changes thwart cyberattacks, and found that the advice generally doesn‘t make much sense, since, as the study notes, someone who obtains your password will use it immediately, not sit on it for weeks until you have a chance to change it. "That’s about as likely as a crook lifting a house key and then waiting until the lock is changed before sticking it in the door," the Globe says. Rather, frequent password changes are simply a waste of time and, therefore, money. According to the Microsoft researcher‘s very rough calculations: To be economically justifiable, each minute per day that computer users spend on changing passwords (or on any security measure) should yield $16 billion in annual savings from averted harm. No one can cite a real statistic on password changes‘ averted losses, but few would estimate it‘s anywhere approaching $16 billion a year. |
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原文地址：http://blog.csdn.net/pan_tian/article/details/48829355
