Is this reome shut down application secure?

i had an idea,how secure is it?

I have a computer running and i want to turn it off remotly,witout using too much mobile data. I have a webpage. My computer is running a python script,that's using wget to download this webpage's index.html every 30 minutes. If the index has a username a password and a random phrase in it. If the index has the right credentials,the python script reads it,hashes it and shuts my PC down