Re: [spam][spam][spam] crazy

Thought Email List: unsolvable puzzle fun Subject: reversing simple hashes From: excited naive puzzler i was thinking a little about the time travel idea and how you could generalize that to reversing of math! this seems like a reasonable gentle puzzle that's known to be hard enough that thinking about it wouldn't impact much maybe we could think about the XOR function. i recall it has a basic problem regarding unknownness of the precise inputs.