What does "Authentication" mean creating key with Kleopatra ? (see image) The image is in french sorry, please help me
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Mainly, this usage is for subkeys that would be used as SSH keys via gpg-agent's "SSH agent emulation" feature – so it's similar to how your ~/.ssh/id_rsa is an authentication key. (In theory it could also be used for authentication in other protocols, but in practice it's just SSH really.)
(The usage is separate from "Signature" because authentication keys are typically used to create very short-term signatures that are only meaningful within a particular handshake, so the requirements for key protection are slightly different. For example, a smart-card might require a PIN for every signature from a signing key, but only require a PIN every hour for an authentication key.)
grawity
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