You totally need one of those signs that says, "This house is guarded by an attack cat".

Finally, a cat that does something useful

So the cat attacks people who go through the door, but not the window? Great logic little kitty.

I think YDI it Op, for not training your cat better. Most cats don't attack people, let alone their master when they walk in the door. Leave your cat with food in its dish when you go out, they tend to be way more docile and lazy when they are fed. (If you don't already do that). And stop using the window and start using the door. Show the cat who's boss. Right now, sounds like the cat is.

call catwoman she'll know what to do about that

The easy solution: make sure you get home before dark and stay at home until the next morning. Otherwise, learn how to bitch-slap an attacking housecat. Crawling through the window brings shame to all of us **** Sapiens. You are a disgrace to our species!

So I'm guessing OP's cat is the "man of the house"

It works right? But why would you need to sneak in? In would think they would like to have as a guest,,,

Who needs a guard dog when u have a guard cat

Ever think of locking it up on nights you go out?