I-D ACTION:draft-hoffman-des40-00.txt

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       Title     : Creating 40-Bit Keys for DES                            
       Author(s) : P. Hoffman, R. Housley
       Filename  : draft-hoffman-des40-00.txt
       Date      : 05/14/1997

This document describes an method for shortening DES keys from 56 bits to 
40 bits. The shortened keys are generally known as "DES-40". The motivation
for this weakening is that some localities (such as the United States) give
special preference to applications that use 40-bit keys. The weakened keys 
are then used with the DES encryption algorithm in the same manner as 
full-strength keys.                                              

There are many possible methods for reducing a 56-bit key to a 40-bit key. 
The method in this draft was chosen because one method is needed for 
interoperability.  Further, this method has been known to occaisionally 
have been approved for export from the United States.                                             

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