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Delivery McGee posted:And all the really fun stuff is encrypted using one-time pads, which are completely random matrices; pretty much the only way to crack a one-time pad before the heat death of the universe is to capture a person using it before they have a chance to destroy their copy of the pad. Assuming the pads are truly random, there's not even a way to crack it given infinite time, since there exists a key that will decrypt the ciphertext to any message, and all keys occur with equal probability.
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Jul 14, 2016 01:57
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Delivery McGee posted:Did you even read the second sentence of the bit you quoted? You're posting in a cryptography thread, and cant even crack the code of the English language. I'm pretty sure "the end of the universe" counts as "(effectively) infinite time." Hence , as with Enigma, the best (nowadays the only) way to crack a decent code is to ice the guy before he has a chance to burn or throw the codebooks overboard/chew and swallow the one-time pad/thermite or degauss the HDD. It's a big difference, actually. There are multiple cryptosystems that would take effectively infinite time to break given current technology, but it is impossible to crack a properly-used one-time-pad even with infinite time, or some technological advance that increased effective computing power by an arbitrary amount. In practice, right now, the difference is indeed trivial because, in either case, the only way to practically decrypt something encrypted with a one-time-pad or a modern cryptosystem is through rubber-hose cryptography or exploiting improper use. There is, however, a massive theoretical difference between the two.
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Jul 29, 2016 16:24
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