GnuPG key capabilities

[Christoph Anton Mitterer]

Joe Vender wrote:

>A specific key's capabilitie(s) are the defined purpose(s) or usage of the
>particular key. For example, when you generate a key, you are asked what
>the key should be used for (encrypt only, sign only, encrypt & sign,
>authentication, certification). These are the possible key capabilities,
>and when chosen at key generation time, become the key's capabilitie(s).
>The key's capabilities are displayed after "usage:" when you do an
>gpg --edit-key.
>
Ah,.. thanks :-)

Ok,.. encrypt/sign is clear,... but what can I do with authentication an 
certification?

Best wishes,
Chris.
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