Simon's Braided Stream Cipher
William "Alain" Simons proposal for using a really-random stream to
select between multiple data channels on a bit-by-bit basis. One or
more of the channels might also be really-random, in which case new
key material can be transported to the far end as a side-effect.
Of course, if we are allowed to expand the ciphertext by 2x,
virtually any cipher can transport key material in a separate
[Here at least one Simon and Ritter exchange was lost.]
- 1992-08-18 Ross Anderson: Ross
feels that the Braid was "demolished" in: Anderson, R. 1990.
Solving a Class of Stream Ciphers. Cryptologia 14(3):
235-238. But the referenced article attacks multiplexed RNG's,
whereas the Braid multiplexes data.
- 1992-11-05 Alain Simon: Alain
points out that the Braid can contain multiple different
ciphertexts, a characteristic which could be useful in forced
contact with law-enforcement.
Terry Ritter, his
current address, and his
Last updated: 1995-10-31