Verifying authenticity of Debian CDs

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From	Semih Ozlem <semihozlemlinuxuser@gmail.com>
Newsgroups	linux.debian.user
Subject	Verifying authenticity of Debian CDs
Date	Fri, 24 Jul 2020 18:00:02 +0200
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On the web page
https://www.debian.org/CD/verify
I am trying to follow the next paragraph.
"To ensure that the checksums files themselves are correct, use GnuPG to
verify them against the accompanying signature files (e.g. SHA512SUMS.sign).
The keys used for these signatures are all in the Debian GPG keyring
<https://keyring.debian.org> and the best way to check them is to use that
keyring to validate via the web of trust."

when I run the command
gpg --verify SHAxSUM.sign SHAxSUM
I get a message saying that

Can't check signature: No public key

How should I proceed to get the necessary public key.
I tried following the link on this page to https://keyring.debian.org/
but I was not able to follow what to do. I tried simple copy and paste of
commands on this page, or their small variants, but was not able to get any
results.

Can someone help please

Thank you in advance.

Semih Ozlem

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Thread

Verifying authenticity of Debian CDs Semih Ozlem <semihozlemlinuxuser@gmail.com> - 2020-07-24 18:00 +0200
  Re: Verifying authenticity of Debian CDs john doe <johndoe65534@mail.com> - 2020-07-24 18:10 +0200
    Re: Verifying authenticity of Debian CDs john doe <johndoe65534@mail.com> - 2020-07-24 18:40 +0200
  Re: Verifying authenticity of Debian CDs Stefan Monnier <monnier@iro.umontreal.ca> - 2020-07-24 18:30 +0200
    Re: Verifying authenticity of Debian CDs Andrew Cater <amacater@gmail.com> - 2020-07-24 18:40 +0200
      Re: Verifying authenticity of Debian CDs davidson <davidson@freevolt.org> - 2020-07-28 12:00 +0200
    Re: Verifying authenticity of Debian CDs Andrew Cater <amacater@gmail.com> - 2020-07-24 18:40 +0200
    Re: Verifying authenticity of Debian CDs davidson <davidson@freevolt.org> - 2020-07-28 11:50 +0200

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