Also. Dave Plumber (davepl) who holds the world record score for tempest did a series on hacking Tempest :

Part 1:

https://youtu.be/BjsVSEbXDOM?si=2zWTuPWkeCBqqzDo

Part 2:

https://youtu.be/jDshLbzGWh8?si=NeaCYllMFnX0B5bI

Part 3:

https://youtu.be/uSlerZqggKo?si=CJZqhcISuOks1EWM