Closing ThoughtsĬhecking the signatures of your files against a checksum can be a pain, but it’s not nearly as much of a pain as having a compromised system because you downloaded a pre-hacked ISO, or a file that comes with a complimentary backdoor. You’re just looking for your file to come up “OK.” If you don’t see anything, that means that the signature on the file didn’t match the checksum, and it’s bad. You can leave off everything after the checksum file, but you’ll get a log of extra junk that you don’t need. Use the sha256sum tool to check it against the SHA256SUMS file that you downloaded and verified. You’re finally ready to check the file itself. $ gpg -verify SHA256SUMS.sign SHA256SUMSĪ valid signature will report a good signature but also give warnings that GPG can verify the owner. It uses a simple command to check that they match the signatures from the keys that you imported. Once you have the checksum files, you can verify them with GPG. If you haven’t already, download those files. Others might call them something slightly different. Debian calls them SHA256SUMS and SHA256SUMS.sign. Like a lot of distributions, Debian places them in the " repository with their ISOs. Get The ChecksumĮvery website is going to place the checksum that should accompany your download in a different place. The key could be identified by either the key ID or a fingerprint that looks something like this 8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092. GPG takes both the address of the keyserver and the key(s) to download. You need to fetch a key from the keyserver belonging to the developers who created the file, in this case, Debian. You’re going to need a key to compare the signature on the ISO to. Just download it with wget for simplicity. Otherwise, this guide will use a Debian ISO. If there’s an ISO that you need, grab that. Verifying a download with its a GPG key is actually very simple, so there’s no reason to skip it. It wasn’t that long ago that Linux Mint suffered a major security breach and handed out corrupted installation ISOs. Most downloads can be verified with a signed GPG key or a checksum, but few are as important as ISOs.
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