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====== gpg ======

===== keys =====

First, create a key pair to identify yourself:

<code>
gpg --full-generate-key
</code>

This will ask for a user name and e-mail address, and the keys will be coupled to that e-mail address.

Now, export the public key so you can publish it.

<code>
gpg --armor --export EMAIL-ADDRESS > public-key.gpg
</code>

Anyone who wants to encrypt something for you needs to import your public key:

<code>
gpg --import public-key.gpg
</code>

===== encryption =====

Now people with your key can encrypt data for you:

<code>
gpg -r EMAIL-ADDRESS -e FILE-TO-ENCRYPT
</code>

This will create an encrypted file FILE-TO-ENCRYPT.gpg that they can send you.

===== decryption =====

The data can be decrypted by whoever owns your private key (hopefully only yourself; just in case, make sure to use a non-empty passphrase when you create your keys):

<code>
gpg FILE-TO-DECRYPT.gpg
</code>