The Case for Short OpenPGP Key Validity Periods

After I moved to a new OpenPGP key (see key transition statement) I have received comments about the short life length of my new key. When I created the key (see my GnuPG setup) I set it to expire after 100 days. Some people assumed that I would have to create a new key then, and therefore wondered what value there is to sign a key that will expire in two months. It doesn’t work like that, and below I will explain how OpenPGP key expiration works; how to extend the expiration time of your key; and argue why having a relatively short validity period can be a good thing.
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