If you are looking for more open challenges, both the 11b-x-1371 series and Cicada 3301 have unsolved stages. I have a copy of the last Cicada code book in a bo

If you are looking for more open challenges, both the 11b-x-1371 series and Cicada 3301 have unsolved stages. I have a copy of the last Cicada code book in a box somewhere, as it looked like a forked fake path, but it's a kitschy bit of internet apocrypha. Also, just do cryptopals (which I haven't actually done and still really should at some point). The John McAfee deadman switch puzzle looked like a hoax, but judging by the number of transactions on the $whackd blockchain and the stakes involved if even a fraction of what he was on about were true, it's plausible NSA or GCHQ got to it first. Those are just ones I can think of off the top of my head. If nothing else has come out of the stream of scandals afflicting that agency, it's that they need better people. If you are eligible, do it, as you could be the change, and it appears the opportunity for improvement there is truly unlimited.