Problem choosing subject for bachelor thesis

As the title explains I'm having some trouble coming up with something to work about. I'm not sure if this is the right place, but since it's a security forum I thought why not. If not, please redirect to where you think is more appropriate.

I've had some thought about it myself of course, but I can't really come up with something specific. The ideas I've been wandering about is something about key encryption / key exchange in protocols (haven't figured out a specific question, but I think it would be fun to work with).

If anyone have ideas it would be very appreciated. I'm open for basically anything as long as it is "covered in my programme".

My programme has been covering some basic programming and a deep insight into networking and operative systems (how file systems work, how processes works etc). There has been mostly theoretical but we have applied it in reality too (Laborations, projects, etc).

If there is any more information you'd like to know, I hope I can answer them.

Thanks in advance.