Unfortunately, I think the public key from that service is no longer importable in modern GnuPG.
https://gnupg.org/faq/whats-new-in-2.1.html#nopgp2 Trying to import the public key on this page results in no public key being imported. Without this the service cannot be used to verify the signature on a timestamp report (I reported this to them several years ago. No changes were made). Also, this service is not a very secure source of time. They use their own clock. They claim some security by using an incrementing counter and publishing signed snapshots to a usenet group. Bottom line though is this service is pretty ancient and requires a lot of trust on your part of the administrator. http://www.itconsult.co.uk/stamper/stampinf.htm $ gpg2 --verbose --import stamper.asc gpg: armor header: Version: 2.6.3i gpg: Total number processed: 3 gpg: skipped PGP-2 keys: 3 $ gpg2 --version gpg (GnuPG) 2.1.16 > Bertram Scharpf wrote: > > > I want to make evidence that I created a document > > _before_ a certain point of time. > > > > > http://www.itconsult.co.uk/stamper.htm > >
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