This behavior handles encrypting and decrypting fields, to store information securely in the database. It uses either mcrypt or CakePHP's built-in Security::cipher.

1. Save cipher.php into app/models/behaviors/

2. In the model that has the fields to encrypt, add Cipher to the $actsAs array, along with the settings to use.

    var $actsAs = array(
    	'Cipher' => array(
    		'fields' => array('password')
    	)
    );
   

• fields (array): Fields to cipher. Default: no fields
• autoDecrypt (boolean): Decrypt ciphered fields automatically. Default: true
• key (string): Key to encrypt with. Default: Security.salt
• cipher (string): Cipher method to use (cake OR mcrypt OR auto). Default: auto

https://github.com/jmillerdesign