Samy Kamkar is a security researcher know of uncovering vulnerabilities in wireless systems. His talk at the 2017 Hackaday Superconference covered keyless entry systems for automobiles, using man-in-the-middle replay attacks.
It's easy to look at Samy and assume he has super-human reverse engineering skills. That may be true, but they're built up from a set of simple first steps which he discusses in this interview. Start by researching, look for patterns, and break down big problems into small ones.
Watch Samy Kamkar's talk at the 2017 Hackaday Superconference:
https://www.youtube.com/watch?v=RpD-yMcg4P4
Read the article:
http://hackaday.com/?p=288189
Visit Samy Kamkar's webpage:
https://samy.pl/