GPG Tutorial

Directly Verifying OpenPGP Keys

How to verify a PGP signature with GnuPG
If we would have specified the User ID instead of the Key ID, all matching keys would have been downloaded instead of just one. This is actually very close to the web of trust network and indeed uses the same tools. Determine the level of security you and your network require and seek out software and services to accommodate safe data sharing. To be more specific, your public key lists the algorithms that you request other people to use when they encrypt messages to you. Only once the identity of a user and key has been fully verified should a key be marked as marginally trusted or trusted.

What signed software looks like

Validating a PGP key without personal contact

This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. I've added the public key of Diceware creator please use it as a practical example , I've added it by downloading diceware. This showed that the file was signed by key ID: But that's what gpg showed me! Sure, it shows the name in the key ID owner in gpg, and it lists the same fingerprint found here.

But neither of those is a trusted way to verify. The fingerprint is on an untrusted page, and for all I know, it's been changed in transit before reaching my PC. And the name is just arbitrary data that I can replicate myself using any gpg client. I remember once I imported a key of someone, and they told me to view the "Web of Trust" signatures. I've been trying to find that command but I just couldn't pinpoint it with certainty. I found this command, which I think it's the WOT command: Assuming I have done everything here correctly, and that I found gpg --list-sig ACA1 which if issued will produce this:.

ORG] aren't all also forged identities? This is the Diceware list I'm using in this question. Important note before I start: You have to perform this verification on your own, but there are tools like certifications in the web of trust that help you doing so. For the same reasons, I cannot provide you with a step-by-step tutorial on verifying a given OpenPGP key, but can only give some advice on how you could possibly verify it on your own.

This is rather obvious. Find the owner, and ask him through a trusted channel. Meeting him probably involves least hassle -- apart from fixing an appointment and travelling.

If this is too much hassle or expensive which it probably will be , you can go for other ways of verifying the fingerprint choose depending on your paranoidity, not all of those will be appropriate for your use case. The last points only can be an indication that everything's fine, and how much of those you accept depends on your needs. An alternative is verification through the web of trust. A helpful tool for building a trust chain would be the PGP pathfinder , I linked an example with a trust path from my key to Anold Reinhold's key which is of limited use, by the way.

For verifying throughout the web of trust, you have to build a trust path, this means there must be a way to validate each step in-between. If there is a valid key with an outgoing certification, the certified key will also be valid; also depending on the maximum path length, certification level and trust settings.

I put together some more details in " What is the exact meaning of this gpg output regarding trust? If you cannot build a trust path, because you don't know anybody of those, you could go for trusted organizations. Either fetch all of keys that issued certifications, or query a key server which already knows all of them. Do you recognize any well-known and trusted organization? It is available for probably all relevant distributions on Debian derivatives, the package is called pgpdump like the tool itself.

To verify and list the fingerprint of the key without importing it into the keyring first , type. The option --list-packets parses pgp data from a file and outputs its structure - in a very technical way, though. When parsing a public key, you can easily extract the user ids and the key ids of the signatures.

Be wary that this command only parses the data format, it does no validation of signatures or similar things. When I stumbled up on this answer I was looking for a way to get an output that is easy to parse. For me the option --with-colons did the trick:. Documentation can be found here. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

How to display gpg key details without importing it? Amos Shapira 1, 2 18 If no command is passed, GnuPG tries to guess what you want to do -- and for key data, this is printing a summary on the key: Machine-Readable Output GnuPG also has a colon-separated output format, which is easily parsable and has a stable format. Jens Erat born in Stuttgart, Germany: RSA e 17 bits I just used "gpg --list-keys path-to-key-file" and got what I wanted to see: I seem to be able to get along with simply: This output is all I care about.

Therealstubot 6 Ronny Andersson 8 This should be the accepted answer imo. I agree with the comment-posted-as-answer by Skyr.

ACK, this is very good, doesn't require local personal keyring etc. Skyr 4 8.

Using Stronger Algorithms