Input a unique string I could watch for, fire up SoftICE, watch for the string, and then step through until the == comparison happened, then either grab the calculated key and input it, or patch the comparison from == to != or just return true, depending on the implementation.
I did a massive crack that involved a program and it’s inf/dll hardware driver package.
Some of the most rewarding work I’ve done and also just so tedious!
Having to stop the OS like that and accidentally getting to the kernel but then not wanting to lose my position so having to hit step over and step out until just the right place… whew.
Cracking and RE were just gateways into a career in (defensive) security for me.