No! That's the idea of encryption. You need to enter the router config, navigate to the wireless security settings and replace the ****** with a new passkey. I strongly suggest that your first open Notepad and create the key in that; select it (Ctrl + A) and copy it (Ctrl + C), then save the file. Go to your router config and paste (Ctrl + V) the key into the box (or boxes, if there are two).
Then do the same copy/paste routine when you first connect a wireless client with the new key.