KMail/gpg
Vous pouvez utiliser kmail et gpg pour envoyer des messages chiffrés ou signés numériquement. Pour ce faire, il y a les boutons Signer et Chiffrer dans la fenêtre d'écriture de kmail. Elle apparait si vous cliquez sur .
Vue d'ensemble : GPG
Une toile de confiance comprend un groupe de personnes qui se font confiance les unes aux autres. Pour montrer leur confiance, elles ont signés chacune des autres clés. gpg permet de faire cela.
The web of trust is extended in key signing parties that go like this:
- you (me@home.org) meet John Foo (foo@bar.org) who is already a member of the web of trust
- you install gpg
- you have a private/public key pair or generate one with
gpg --gen-key
Your private key is stored in "secring.gpg", your public one is stored in "pubring.gpg". You keep your private key secure, and are free to distribute your public key.
- you find out your key's fingerprint (name)
gpg --list-keys /home/me/.gnupg/pubring.gpg ---------------------------------- pub 1024D/45E377BB 2008-02-03 [...]
- you upload your public key to your key server
gpg --send-key
- John downloads your key from the key server
gpg --search-key me@home
- John checks your passport and signs your key
gpg --sign-key 45E377BB
- John uploads your key again
gpg --send-key 45E377BB
- You are now part of the web of trust and your public key is on the key server.
How to...
Import a saved keyring
If you have a keyring saved to your disk, reload ("import") it like this:
gpg --import
Then call kgpg and set your trust on your private key to "ultimate."
TroubleShooting
Whatever problems arise, first make sure your gpg is properly set up:
- List your keys
gpg --list-keys
- Has to deliver something like a sensible list of keys.
- Check the output of
gpg --update-trustdb
- In case of a problem look at the below.
No ultimately trusted keys found
If
gpg --update-trustdb
delivers
gpg: no ultimately trusted keys found
Call kgpg and set the trust of your private key to "ultimate'"
"Gpg does not seem to be running..."
You get an error message like this whenever you start up? You need scripts to make it start and stop cleanly. You can get scripts here:
Copy them into your ~/.kde/env and ~/.kde/shutdown folders, check permissions, and make sure they are executable.
Still not working?
Check which pinentry packages you have installed. You may find you are missing pinentry-qt4.
Other Key Considerations
From time to time you need to do some maintenance work on your keys. KGpg was written to make this easier. There you will be able to extend the life of your keys, refresh them if they have already expired, change your passphrase, or revoke a compromised key.