Hey sorry, didn't check back on this comment for a while. I can't recommend any _courses_ in particular (unless you're a Georgia Tech student, in which case "CS 6265: Information Security Lab" is absolutely incredible).
One really fun way to hone your skills is https://microcorruption.com/, a ctf-style simulated hacking game originally made by Square and Matasano.
One really fun way to hone your skills is https://microcorruption.com/, a ctf-style simulated hacking game originally made by Square and Matasano.