This also allows some good plausible deniability. If someone knows you're using this sytem and forces you to decode your collection of random bit files, you can arrange 9 out of 10 of them to get a harmless plausible result (a bunch of harmless pictures / private tax files etc). Only by adding the last bit file does it turn into what you're trying to hide.

If you only show part of the solution, it looks like you've unlocked it and the result is harmless.