Public bug reported:
The Ubuntu ISO and official derivatives could contain embedded MD5
checksums at the iso9660 metadata layer by using isomd5sum tools to
implant and check the checksum. This may be faster than checking each
package at the file system level because the verification process when
done at the block level is a single linear seek without having to jump
around. The checksum can even be verified after the image has been
burned and mounted.
>From the tool's README:
isomd5sum provides a way of making use of the ISO9660 application data
area to store md5sum data about the iso. This allows you to check the
iso given nothing more than the iso itself.
** Affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1208285
Title:
Official Ubuntu ISO should use isomd5sum for embedded checksum
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