I-D ACTION:draft-hoffman-des40-03.txt

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	Title		: Creating 40-Bit Keys for DES
	Author(s)	: R. Housley, P. Hoffman
	Filename	: draft-hoffman-des40-03.txt
	Pages		: 2
	Date		: 03-May-99
	
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
occasionally have been approved for export from the United States.

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