问如何在Magento社区版中使密码更安全？

EN

   public function getHash($password, $salt = false)
    {
        return $this->hash($password);
    }
   public function hash($data){


        return sha1($data); 
    }

    public function validateHash($password, $hash) {
        return $this->hash($password) === $hash;

        }
}
?> 

<?xml version="1.0" encoding="UTF-8"?>

<!--
    Document   : config.xml
    Created on : July 26, 2012, 1:12 PM
    Author     : sanjeewani
    Description:
        Purpose of the document follows.
-->

<config>
    <modules>
        <My_ShaModule>
            <version>0.1.0</version>
            <depends>
             <Mage_Core />
            </depends>
        </My_ShaModule>
    </modules>

    <global>
        <models>
            <core>
                <rewrite>
                 <encryption>My_ShaModule_Model_Encryption</encryption>
                </rewrite>
            </core>
        </models>
        <helpers>
            <core>
             <encryption_model>My_ShaModule_Model_Encryption</encryption_model>
            </core>
        </helpers>
    </global>

    <frontend>
        <routers>
            <my_shamodule>
             <use>standard</use>
                <args>
                    <module>My_ShaModule</module>
                    <frontName>shamodule</frontName>
                </args>
            </my_shamodule>
        </routers>
    </frontend>
</config>