Community wiki: feel free to edit
#As a main skill#
malware analysis
digital forensics and Incident response
security assessment, pen testing
is this website/software/cpu really secure? which one is the most secure?
exploit development
si vis pacem, para bellum
plagiarism detection (if a companiescompany sues another one because they claim they stole their source code)
emulation
adapting older games to newer medias
- such as DotEmu, Good old games
adapting older hardware to newer
- emulate older protection dongles for no longer supported softwares
source code recovery
because backup may fails
business logic recovery / process recovery (regarding Legacy Systems)
because documenting all the quirks, workarounds and clever solutions adequately is hard
#As a side skill#
- understanding what a program is about
- because too often, one doesn't have the time to document how an internal tool works