Prepare directory and generate rsa keys

rsa_keys

$ mkdir ~/.ssh
$ cd ~/.ssh
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter the file in which to save the key (~/.ssh/id_rsa): computername_bitbucket
Enter passphrase (empty for no passphrase): <very secret password>
Enter same passphrase again: 
Your identification has been saved in computername_bitbucket.
Your public key has been saved in computername_bitbucket.pub.
The key fingerprint is:
aa:bb:cc:dd:22:33:aa:bb:cc:... paul@vtsw
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|                 |
|                 |
|                 |
|       /-\       |
|        |        |
|       . .       |
|:-)              |
+-----------------+