ITAR's 40 bit limit

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> From: "David F. Ogren" <ogren at cris.com>
> Date: Sat, 20 Jul 1996 19:45:29 -0400 (EDT)
> 
> Another paradox of the US export regulations.
> 
> The NSA is allowing 40 bit crypto exports.  So as a hypothetical example 
> assume that I write a crypto program that uses 40 bit RC4 to encode data 
> (licensing from RSA).  I then get an export license using the accelerated 
> process for 40 bit RC4.

Sorry, RC4 only works in OFB mode.  It is not a block cypher.