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Article #259Re: Ontario Government Computers: Prudes Veto Vulgarity in Cyberspace
From: James Jones
Date: Sun, 05 Jun 1994 20:29
Date: Sun, 05 Jun 1994 20:29
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In article <CqwoEt.MAv@ecf.toronto.edu> segalh@ecf.toronto.edu (SEGAL HENRY ALAN) writes: >When encryption algorithms are being studied, it is generally assumed that >the algorithm for encryption is known by the one who is trying to decrypt. Yup. Just like Kerckhoffs (sp?) said, "security must reside in the keys." >In many cases, however, the algorithm is not known. How, then, is the text >deciphered? Tanquam ex ungue leonem, as Bernoulli said. (Guess I'm in a quoting mood today.) To take a very simple example, if you know the folks at each end are English speakers and you find that the ciphertext consists of letters and has English single letter frequencies, it might pay off to try the hypothesis that they used a transposition cipher (i.e. they "just" permuted the letters). James Jones Opinions herein are those of their respective authors, and not necessarily those of any organization.
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