A class for creating random secret keys. This class will do its best to
create a random secret key that‘s as secure as possible, using
whatever methods are available on the current platform. For example:
generator = Rails::SecretKeyGenerator("some unique identifier, such as the application name")
generator.generate_secret # => "f3f1be90053fa851... (some long string)"
This class is deprecated in Rails 2.2 in
favor of ActiveSupport::SecureRandom.
It is currently a wrapper around ActiveSupport::SecureRandom.