On Wed, Oct 30, 2013 at 11:33:18PM +0100, Philipp Klaus Krause wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Is there a known good way to combine multiple symmetric ciphers into > something that is at least as strong as the weakest of them?
I sincerely doubt that there is, in the general case. That's the point: you have to analyze each combination as if it were a new, untried cipher. It seems useless to ask whether one can benefit from composing multiple unspecified symmetric ciphers; much more useful to ask whether e.g. AES+BLOWFISH is at least as strong as, or stronger than, either AES or BLOWFISH alone. Then ask the same question for each composition you think promising. You will wind up doing quite a LOT of math. You could probably get a book out of it, if you do a thorough job. -- Mark H. Wood, Lead System Programmer mw...@iupui.edu Machines should not be friendly. Machines should be obedient.
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