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Add note about sys-usb

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Andrew David Wong 2022-07-20 23:24:23 -07:00
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project-security/verifying-signatures.md
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@ -627,14 +627,17 @@ the illusion that the data is being read from the USB drive).
Therefore, in order to make things a bit more difficult for your hypothetical Therefore, in order to make things a bit more difficult for your hypothetical
adversary, you may instead wish to perform the re-verification in an adversary, you may instead wish to perform the re-verification in an
environment that has never seen the original ISO (e.g., a separate offline environment that has never seen the original ISO, e.g., a separate offline
computer or a fresh VM the storage space of which is too small to hold the computer or a fresh VM the storage space of which is too small to hold the ISO.
ISO). In that case, you'll have to obtain the size of the ISO in bytes and (Note: If you're doing this in Qubes, you can attach the block device from
enter it into the above command manually. You can, of course, obtain the size sys-usb to a separate new qube. You don't have to perform the re-verification
by simply using the `stat -c %s /path/to/iso` command from above on the machine directly in sys-usb.) In that case, you'll have to obtain the size of the ISO
that has the ISO. You can also obtain it from the Qubes website by hovering in bytes and enter it into the above command manually. You can, of course,
over any ISO download button on the [downloads page](/downloads/). (You can obtain the size by simply using the `stat -c %s /path/to/iso` command from
also view these values directly in the downloads page's [source above on the machine that has the ISO. You can also obtain it from the Qubes
website by hovering over any ISO download button on the [downloads
page](/downloads/). (You can also view these values directly in the downloads
page's [source
data](https://github.com/QubesOS/qubesos.github.io/blob/master/_data/downloads.yml).) data](https://github.com/QubesOS/qubesos.github.io/blob/master/_data/downloads.yml).)
Once you have the exact size of the ISO in bytes, simply insert it into the Once you have the exact size of the ISO in bytes, simply insert it into the
same command, for example: same command, for example: