CakePHP: Editing Cipher Behavior to use built in cipher instead of blowfish

Question

Does anyone know how to change http://bakery.cakephp.org/articles/view/cipher-behavior to use cakephp's default ciper instead of Blowfish to encrypt/decrypt fields?

After reading through the behavior, I thought that maybe I could just switch out

$bf = new Crypt_Blowfish($key); 

with

$bf = new cipher($key); 

or something to that extent?