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    FCIP and iFCP Keying Problem



    Both FCIP and iFCP intend to require:
    
    	- IKE with pre-shared keys MUST implement
    	- IKE with public-key based keys MAY implement
    	- IKE Main Mode MUST implement
    	- IKE Aggressive Mode MAY implement
    
    That's not acceptable because the result of combining
    the two mandatory (MUST) mechanisms is vulnerable to a
    man-in-the-middle attack.
    
    If IKE with pre-shared keys is "MUST implement" (which
    makes sense, as it's the simplest IKE authentication
    mechanism), then:
    	- IKE Aggressive Mode needs to be "MUST implement"
    	- Use of IKE Main Mode with pre-shared keys needs
    		to be "SHOULD NOT use" or "MUST NOT use".
    Alternatively, if IKE Aggressive Mode remains "MAY implement",
    then:
    	- IKE with signature authentication based on public
    		keys needs to be "MUST implement" along with
    		some certificate usage guidelines.
    	- Pre-Shared keys needs to be "MAY implement" (can't
    		be any stronger than the requirement for
    		IKE Aggressive Mode).
    	- Use of IKE Main Mode with pre-shared keys needs
    		to be "SHOULD not use" or "MUST not use".
    
    Changing IKE to remove the Main Mode vulnerability
    with pre-shared keys is not a viable approach.
    
    Sorry,
    --David
    
    ---------------------------------------------------
    David L. Black, Senior Technologist
    EMC Corporation, 42 South St., Hopkinton, MA  01748
    +1 (508) 435-1000 x75140     FAX: +1 (508) 497-8500
    black_david@emc.com       Mobile: +1 (978) 394-7754
    ---------------------------------------------------
    


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Last updated: Fri Sep 07 20:17:13 2001
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