Generating Keys, cont'd

Finally, you will be asked for your passphrase. It's a passphrase because spaces are allowed, so you can use full sentences
Use the longest, most complex password you have a chance of remembering
The passphrase is the weakest part of the cryptosystem, next to the password to your user account
You know the general password rules. Make a respectable passphrase that you can remember
If you forget your passphrase, data encrypted with this set of keys is lost. There is no way to retrieve your passphrase!