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xkcd #2869: Puzzles
(imgs.xkcd.com)
Alt text:
Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
What's with the ominous line about 30 days?
Since websites decided it was okay to delay reporting breaches as long as possible it's the new prudent time frame for updating critical passwords. (Things linked to payments methods or sensitive information)