On Thu, 5 Sep 2013 21:42:29 -0700 Jon Callas <j...@callas.org> wrote: > On Sep 5, 2013, at 9:33 PM, "Perry E. Metzger" <pe...@piermont.com> > wrote: > > > > > It is probably very difficult, possibly impossible in practice, to > > backdoor a symmetric cipher. For evidence, I direct you to this > > old paper by Blaze, Feigenbaum and Leighton: > > > > http://www.crypto.com/papers/mkcs.pdf > > > > There is also a theorem somewhere (I am forgetting where)
See the URL quoted above. That is the implication of their paper. > that says that if you have a block cipher with a back door, then it > is also a public key cipher. Perry -- Perry E. Metzger pe...@piermont.com _______________________________________________ The cryptography mailing list cryptography@metzdowd.com http://www.metzdowd.com/mailman/listinfo/cryptography
