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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:17:20 ADT
Mordechai Ovits (movits@syndata.com)
Mon, 11 May 1998 15:06:41 -0400
Jesús Cea Avión wrote:
> In the Rivest's paper you transmit, indeed, all the 2^n plaintexts for a
> n bit length };-).
Not so. In his paper (before the package tranform stuff), he had the following expansion.
Assuming a 32 bit serial number and a 160 bit MAC, n bits would expand to 388n.
This is because Ron is sending it out like this:
quote from http://theory.lcs.mit.edu/~rivest/chaffing.txt
>To make this clearer with an example, note that the adversary
>will see triples of the form:
> (1,0,351216)
> (1,1,895634)
> (2,0,452412)
> (2,1,534981)
> (3,0,639723)
> (3,1,905344)
> (4,0,321329)
> (4,1,978823)
> ...
>and so on.
Every bit is getting 2 32-bit serial numbers, its own complement, and 2 160-bit MACs.
a 10KB file would explode into a 3.789MB file.
Not too practical, eh? :-)
-- o Mordy Ovits o Programmer / Cryptographer o SynData Technologies Inc. o Download A Free Copy Of Our Software At: o http://www.syncrypt.com
The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:17:20 ADT