Amazon Access Key

CarrierWave.configure do |config|
  config.fog_credentials = {
    :provider               => 'AWS',                        # required
    :aws_access_key_id      => 'xxx',                        # required
    :aws_secret_access_key  => 'yyy',                        # required
    :region                 => 'eu-west-1'                  # optional, defaults to 'us-east-1'

  }
  config.fog_directory  = 'boxon'                          # required
  config.fog_public     = false        

Source: http://pastie.org/pastes/9772698/download