Unauthentication
by Bruce Schneier
In computer security, a lot of effort is spent on the authentication problem. Whether it's passwords, secure tokens, secret questions, image mnemonics, or something else, engineers are continually coming up with more complicated—and hopefully more secure—ways for you to prove you are who you say you are over the Internet.
This is important stuff, as anyone with an online bank account or remote corporate network knows. But a lot less thought and work have gone into the other end of the problem: how do you tell the system on the other end of the line that you're no longer there? How do you unauthenticate yourself?
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