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Re: Special number
It seems my post is causing more of a problem than the original question. Take the answer, which is 98754210. Rather than simply giving the answer, I gave the MD5 of the answer, computed by going "echo 98754210 | md5sum". MD5 is a common and popular cryptohash, thus anyone who knew the answer should be able to verify that I also know the answer, because they would get the same hash. Yet, from the hash itself it is not easy to extract the answer (short of trying each number in turn until the hash matches).
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