One way to secure the details is always to clear the cache files in the browser features.

This cache will be accessible if cracker( not hacker ) penetrated your system. Especially when the cracker himself is suing Linux. He will be able to view your Encrypted password ( or directly your password) when very little command(or function called to your system).

For router, always set block anonymous request and functions that you think will permit access to your System details.

Good Luck.