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I use ssh regularly and have ssh-agent set up.

How can I use ssh keys to gpg-encrypt a file?

Edit: It seems that this is impossible. Why? ssh can encrypt traffic, so why not also files?

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No, SSH keys are not PGP keys and serve different purpose .
You must have PGP keys in GnuPG keyring.
But - you can convert GPG keys to PGP keys (using gpgkey2ssh) and gpg-agent can take care of ssh keys (using --enable-ssh option). I believe no such tool exists for converting SSH keys to GPG keys and cannot exist.

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I prefer to work in the reverse: use gpg with ssh keys, since I already have an extensive ssh infrastructure. – nalply Sep 15 '10 at 12:15
that is not possible. Just view size of SSH public key and GPG public key -> SSH key contains much less info. – Kristaps Sep 15 '10 at 18:34
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Okay, some things are not possible with SSH keys but I believe that encryption is possible since ssh encrypts traffic. Perhaps I should have asked: How can I encrypt a file with an SSH key? – nalply Sep 16 '10 at 11:48

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