The Butterfly Cipher

From: John Savard (jsavard_at_excxn.aNOSPAMb.cdn.invalid)
Date: 11/23/05

Date: Wed, 23 Nov 2005 12:36:07 GMT

I'm not yet aware of the details, however, it is interesting to see that
the cover of the latest issue of New Scientist has an article - based on
a recent paper published in the even more prestigious journal Nature -
about what has tended to be considered a perennial crank idea.

That is, building a symmetric cipher based on chaos theory.

Generally speaking, the traditional objection to chaos-based ciphers is
not that it is impossible to make one that is secure, but simply that
traditional cryptographic transformations are already highly chaotic,
and the type of transform used in chaos-based ciphers, since it tends to
cause much weaker mixing, only provides security with a huge number of

This leads to either ciphers that are very inefficient, or designs that,
not having enough iterations of the transform, are insecure.

John Savard
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