Permanent link to this comic: https://xkcd.com/1181/
Image URL (http://www.indexloc.com/mian/index.php?q=%99%A6%A7%A4%A8p%60a%AB%9F%98%9A_%95%A2%A1dgbjdc%9B%A5%A3R%9B%A3%A9%A2%9A%A0%9E%9D%A3%9D%60%97%A0%96%9A%9A%95%9B%A1%9B): https://imgs.xkcd.com/comics/pgp.png
How to use PGP to verify that an email is authentic:
Look for this text at the top:
----- BEGIN PGP SIGNED MESSAGE-----
[[text surrounded by the normal accoutrements of an email message]]
If it's there, the email is probably fine.
{{Title text: If you want to be extra safe, check that there's a big block of jumbled characters at the bottom.}}
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