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I'm using gnupg and I've just seen that people can sign keys with an expiration attached.

The expiration of individual signatures can be seen in gpg --list-sigs <KEY> when setting this in your .gnupg/gpg.conf:

list-options show-sig-expire

However, I can't find any information on how to add such an expiration to a signature.

How do I do that?

5

[Edit after the clarification]:

I believe you are looking for the "esoteric options of the GPG", you can have a look at them in here:

http://www.gnupg.org/documentation/manuals/gnupg-devel/GPG-Esoteric-Options.html

Specifically you are looking for the option:

--ask-cert-expire

Use it when issuing a new key.

  • 2
    --ask-cert-expire and/or --default-cert-expire – mr.spuratic Jan 16 '14 at 10:57

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