sha512sum-error at debian-live-11.5.0-amd64-gnome.iso

Gerd Mühlenbruch <[email protected]>
Newsgroups gmane.linux.debian.devel.cd
Message-ID <[email protected]>
Dear maintainers

Today I downloaded the present debian-live-11.5.0-amd64-gnome.iso via my 
prepared script
*********
Optionen="-c -nv --show-progress --limit-rate=800k -a Ziele.log"
Pfad="https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid"
wget $Optionen $Pfad/debian-live-11.5.0-amd64-gnome.iso
wget $Optionen $Pfad/debian-live-11.5.0-amd64-gnome.log
wget $Optionen $Pfad/debian-live-11.5.0-amd64-gnome.packages
rm SHA512SUMS
rm SHA512SUMS.sign
wget $Optionen $Pfad/SHA512SUMS
wget $Optionen $Pfad/SHA512SUMS.sign
*********

The final check
     sha512sum --ignore-missing -c SHA512SUMS
resulted into
     debian-live-11.5.0-amd64-gnome.iso: FEHLSCHLAG
     debian-live-11.5.0-amd64-gnome.log: OK
     debian-live-11.5.0-amd64-gnome.packages: OK
     sha512sum: WARNUNG: 1 berechnete Prüfsumme passte NICHT
It was my first failed check.

Already since some years, the check
     gpg --keyserver keyring.debian.org --verify SHA512SUMS.sign SHA512SUMS
reports that the key doesn't have a trusted signature
     gpg: Signatur vom So 11 Sep 2022 01:00:38 CEST
     gpg:                mittels RSA-Schlüssel 
DF9B9C49EAA9298432589D76DA87E80D6294BE9B
     gpg: Korrekte Signatur von "Debian CD signing key 
<[email protected]>" [unbekannt]
     gpg: WARNUNG: Dieser Schlüssel trägt keine vertrauenswürdige Signatur!
     gpg:          Es gibt keinen Hinweis, daß die Signatur wirklich dem 
vorgeblichen Besitzer gehört.
     Haupt-Fingerabdruck  = DF9B 9C49 EAA9 2984 3258  9D76 DA87 E80D 
6294 BE9B
This may be my own problem, because I haven't got a book to learn gpg.

Best regards

Gerd Mühlenbruch
Hauptstraße 36
D-89522 Heidenheim
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