[2047] in cryptography@c2.net mail archive
RSA Conference: Apple Crypto
daemon@ATHENA.MIT.EDU (Steve Schear)
Fri Jan 16 10:42:14 1998
In-Reply-To: <v03007806b0e4452eba6f@[168.161.105.216]>
Date: Fri, 16 Jan 1998 00:03:29 -0800
To: cryptography@c2.net
From: Steve Schear <schear@lvdi.net>
Although Apple Computer isn't known for its pursuits of leading-edge=
cryptography, Dr. Richard Crandall, Chief Cryptographer, presented three=
approaches being considered by Apple: Fast Elliptic Encryption (FEE),=
CHAotic-Dynamical encryption (CHAD) and Compryption or holisitic=
(single-pass) compress/encrypt algorithm.
1. Apple claims to own U.S. patents on three significant FEE algorithms:=
5159632. 5463690 and 5581616. Crandall claims FEE is one of the fastest=
possible ECC algorithms for signature (ECDSA or ElGamel), embedding of=
plaintext (FEED) and curve-order calculation.
2. CHAD uses the computational complexity of the n-body classical physics. =
The claim is that the sensitivity of a final chaotic dynamical state to=
its initial conditions may serve as a problem in the same difficulty range=
as factoring or descrete-log. This area has received some attention in the=
past few years (I believe including by the U.S. Navy) See also http://www.e=
fd.lth.se/~d92ms/chaoscrypt.html
3. Comcryption, Crandall claims, is based on a new discovery that there=
exist "galaxies" of reasonably efficient entropy compressors, which can be=
selected by an n-bit key to yield a lossless, single-pass Comcryptor.
(As an aside, in 1989-1990 a mathematician and I unsucessfully attempted to=
losslessly compress/encrypt images by finding the longest matching runs of=
input data against the output sequences of pseudo-random generators=
conditioned to favor the correlation values of the image portion under=
consideration (called this a White Hole algorithm.) To improve coding=
efficiency I used a Hilbert space-filling curve to transform the image to a=
one dimensional string while preserving the two dimensional image=
correlation characteristics. Output of the compressor would be the=
correlation coefficient, seed, displacement and run length values for the=
generator. Anybody care to take up where I left off?)
--Steve
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