Purpose of this page is to decode Linksys router backup configuration file. You can find it by logging into the router's control page, go to Administration->Config Management->Backup button. The use cases are:
I have saved backup the router configuration file and I have lost the password to enter the router
I have the router password, but I have losted the PPPoE password which the router persisted.
I lost both router password and PPPoE passwords and, luckily, my browser has saved the login password to the router.
In no way I am storing your config file, I am deleting the file right after your file is decoded. To be more safe, you can change the password right after you have obtained the passwords.