From: (Ross Anderson)
Newsgroups: sci.crypt
Subject: Re: well braid
Message-ID: <>
Date: 18 Aug 92 10:54:37 GMT
References: <>
Sender: (The news facility)
Reply-To: (Ross Anderson)
Organization: U of Cambridge Computer Lab, UK
Lines: 20

(20 lines) More? [ynq] 

In <>, (W.A.Simon)

> The proposed system works by multiplexing (braiding) two or more bit
> streams.  Depending on the value of key bits, the next bit of output
> is taken from one or the other input.

Something similar has been around in the world of stream ciphers since
about 1980. It was demolished in

`Solving a class of stream ciphers', Cryptologia vol XIV no 3 (July 1990)
pp 285 - 288. 

As far as I can see, your system will have to be modified to withstand 
this kind of attack.

Hope this helps