Basically like browser fingerprinting. Use a lot of indicators that are insignificant on their own to create one powerful method of identification. The problem

Basically like browser fingerprinting. Use a lot of indicators that are insignificant on their own to create one powerful method of identification. The problem with those is that it's really hard to get around them. Changing one of the factors isn't going to help. You'd have to identify the most significant ones to change those (if that's possible).