[Gpg4win-users-en] Certifying an imported public key

Bernhard Reiter bernhard at intevation.de
Thu Feb 1 17:09:46 CET 2024

Am Donnerstag 01 Februar 2024 16:48:13 schrieb David Koch via 
> I have never been able to certify an imported public key. The ones I
> want to certify belong to close relatives. I always receive this error
> message: "Invalid digest algorithm".

chances are good that you are trying to certify an OpenPGP pubkey that
uses a weak digest algorithm, see

How old are the pubkeys of your relatives?
If it turns out to be they are very old, maybe you can suggest to them to 
create new ones?

> What can I do to certify an imported public key?

You could use the command line and the mentioned esoteric option from 
above. :)

(Using the command line to find out more is a typical step for technical 

Best Regards

https://intevation.de/~bernhard   +49 541 33 508 3-3
Intevation GmbH, Osnabrück, DE; Amtsgericht Osnabrück, HRB 18998
Geschäftsführer: Frank Koormann, Bernhard Reiter
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