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<!-- retain these comments for translator revision tracking -->
<!-- $Id$ -->
<sect1 id="verifying-files">
<title>Verifying the integrity of installation files</title>
<para>
You can verify the integrity of downloaded files against checksums
provided in <filename>SHA256SUMS</filename> or <filename>SHA512SUMS</filename>
files on Debian mirrors. You can find them in the same places as the installation images
itself.
Visit the following locations:
</para>
<itemizedlist>
<listitem><para>
<ulink url="https://cdimage.debian.org/debian-cd/current/&architecture;/iso-cd/">checksum
files for CD images</ulink>,
</para></listitem>
<listitem><para>
<ulink url="https://cdimage.debian.org/debian-cd/current/&architecture;/iso-dvd/">checksum
files for DVD images</ulink>,
</para></listitem>
<listitem condition="has-bd-iso"><para>
<ulink url="https://cdimage.debian.org/debian-cd/current/&architecture;/iso-bd/">checksum
files for BD images</ulink>,
</para></listitem>
<listitem><para>
<ulink url="http://&archive-mirror;/debian/dists/&releasename;/main/installer-&architecture;/current/images/">checksum
files for other installation files</ulink>.
</para></listitem>
</itemizedlist>
<para>
To compute the checksum of a downloaded installation file, use
<informalexample><screen>
sha256sum filename.iso
</screen></informalexample>
respective
<informalexample><screen>
sha512sum filename.iso
</screen></informalexample>
and then compare the shown checksum against the corresponding one in the
<filename>SHA256SUMS</filename> respective <filename>SHA512SUMS</filename> file.
</para><para>
The <ulink url="&url-debian-cd-faq;">Debian CD FAQ</ulink> has
<ulink url="https://www.debian.org/CD/faq/index.en.html#verify">more useful information</ulink>
on this topic (such as the script <filename>check_debian_iso</filename>, to semi-automate
above procedure), as well as instructions, how to verify the integrity of the above checksum
files themselves.
</para>
</sect1>
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