I want to install Linux on a USB stick (64GB USB 3.0) and set it to use the laptop HDD as encrypted storage. My aim is to thereby secure my laptop, if it's stolen/in the wrong hands, no USB stick no OS, so the laptop will not boot.
Any feedback on how to accomplish this, what type of encryption scheme to use on the HDD, should the USB stick be encrypted, as well as to the validity of this setup as a means to add an additional physical layer of security to my laptop, would be much appreciated. Or am I grossly over complicating things? Would this create a big hit on performance? My laptop is an older Intel CORE i3 2.1Ghz with 4GB ram.