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Ubuntu: Create GPG Keys #GnuPG #Ubuntu #Markdown

Introuction

GPG keys are used for symmetric key encryption. GnuPG is the most common tool to create such keys.

Requirements

  • Ubuntu server
  • GnuPG, rng-tools

Instructions

Change the shell context to the user which uses the new GPG keys.

su [user]

Or use the root user.

sudo su

Give your server some work, otherwhise gpg won't be able to generator random bytes.

sudo rngd -r /dev/urandom

Genrate the gpg key.

gpg --gen-key

Answert the prompts.

Your selection?: (1) RSA and RSA (default)
What keysize do you want?: 2048
Key is valid for?: 0 = key does not expire
Is this correct?: y
Real name: [firstname] [surname]
Email address: [mail]@[example.org]
Comment:
Change ... (O)kay/(Q)uit?: O
Enter passphrase: [gpg passphrase]
Repeat passphrase: [gpg passphrase]

Kill the rngd task.

sudo service rng-tools stop

Show the new GnuPG keys.

gpg -k

The gpg key id is displayed in the line pub 2048R/>>C58886FB<< 2014-03-14

Export the public key into a text file and back it up in a secure place.

gpg --armor --export -a [gpg key id] > [firstname][surname][server name]#public.key

Export the private key into a text file and back it up in a secure place.

gpg --armor --export-secret-keys -a [gpg key id] > [firstname][surname][server name]#private.key

Exit the user shell context if you have switched to another user.

exit

Store the gpg passphrase in a secure place f.g. KeePass Password Safe.

Source

Unattended, Encrypted, Incremental Network Backups by Kellen Ubuntu: How to create a lot of entropy for GPG key generation from command line

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