can not encrypt (but decrypt) dues to missing pub key

[Ingo Klöcker]

On Mittwoch, 1. April 2020 20:16:30 CEST Matthias Apitz wrote:
> El día Mittwoch, April 01, 2020 a las 08:06:01 +0200, Ingo Klöcker escribió:
> > On Mittwoch, 1. April 2020 19:39:24 CEST Matthias Apitz wrote:
> > > El día Mittwoch, April 01, 2020 a las 06:59:17 +0200, Ingo Klöcker 
escribió:
> > > > On Mittwoch, 1. April 2020 17:30:29 CEST Matthias Apitz wrote:
> > > > > I encounter in my server the following situation: I can decrypt
> > > > > files
> > 
> > > > > but not encrypting any file:
> > Maybe the key is expired or not usable for encryption for some other
> > reason. gpg will happily use an expired key for decryption (of old
> > encrypted data), but it won't use an expired key for encryption.
> > 
> > What does
> > gpg --list-public-keys --with-colons guru at unixarea.de
> > say?
> 
> $ gpg --list-public-keys --with-colons guru at unixarea.de
> tru::1:1585750650:0:3:1:5
> pub:e:2048:1:7BA6AC955EAA2665:1520759851:1583831851::u:::sc:::::::
> fpr:::::::::8BCE0232807D4CCB4F8800D17BA6AC955EAA2665:
> uid:e::::1520759851::DD2F57BCBE052BF39F1E41416DB8DF884B56DB02::guru at unixarea
> .de: sub:e:2048:1:2802AB9D46B97090:1520759851::::::e::::::
> fpr:::::::::8D06C9C9460222C8A26181142802AB9D46B97090:
> sub:e:2048:1:4FAD759204AFE5CB:1585762137::::::e::::::
> fpr:::::::::D9BF745D512FEA9BBEF8923A4FAD759204AFE5CB:

As I assumed, the keys are expired, as can be seen by the :e: after pub/uid/
sub.

If you do
gpg --list-public-keys guru at unixarea.de
you should see when the keys expired. (It's also listed above, but the unix 
timestamp 1583831851 isn't easy to read for humans.)

Regards,
Ingo