如何获取值为`/`（斜杠）的URL参数 - Magento

How to get an URL parameter with value / because I have a value

$encrypted = "Dwe/OAISUD";

www.test.com/test/test/index/encrypted/Dwe/OAISUD

then I want to get it with controller getParam('encrypted');

but in controller I get value

$encrypted = "Dwe";

How to fix that? On Magento way.

$encrypted = urlencode("Dwe/OAISUD");