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GPG key capabilities and usage meanings
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GPG Capabilities.md

Signing is signing data (i.e. gpg --sign the_file)

Certification is signing a key (i.e. gpg --sign-key the_key)

Authentication is signing a challenge (like ssh does). The Authentication stuff can be used to log in to a machine using your GPG key.

The signature math is the same however you do it. The key usage flags are just to classify things.

Originally copied from https://lists.gnupg.org/pipermail/gnupg-users/2005-April/025390.html

https://blog.ddosolitary.org/posts/use-the-ssh-feature-of-gpg-agent/

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