Using PGP keys for SSH

Question

I use a 4096 byte RSA PGP key; since SSH also uses the RSA standard, is it at all possible to use the PGP key as an SSH key without installing additional software on the server (and as little as possible on the client)?

Answer 1

There are several ways, which may or may not work:

• MonkeySphere
• openssh-gpg, a patch for OpenSSH
• SSH.com has built-in support
• gpg2 on Debian comes with a gpgkey2ssh tool, and gpg-agent can act as a ssh agent too, but I couldn't figure out how to actually make ssh use the key for authentication.

Answer 2

SSH2 Version 2.0.13 introduced support for PGP authentication.

excerpt from SSH The Secure Shell

Answer 3

This document shows how to do it on the SSH.com client; I am not sure that it works on OpenSSH but it might be worth a shot.