gpg: used key is not marked for encryption use.

Werner Koch wk at
Tue Jul 27 11:03:42 CEST 2021

On Fri, 23 Jul 2021 20:00, Jonathan Kaczynski said:

> I'm trying to understand the scenario in which we see the log message,
> "gpg: used key is not marked for encryption use." I haven't been able to
> find any mentions of the phrase on the web, so I turned to the source code.

This is a warning that the encryption tool used a key which it should
not have used for encryption (ie. a signing signing key).  Proper
OpenPGP implementation won't allow to encrypt to such a key but some
implementations have bugs.  Technically the keys can be used for both
purposes but out of crypto hygiene this should not be done.  No
immediate risk, though.  For S/MIME is is quite common to use the same
key for encryption and signing.



Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.
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