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Date: Fri, 28 Nov 2003 02:10:19 -0800
From: Crispin Cowan <>
To: Julian Wynne <>
Subject: Re: Unhackable network really unhackable?

Julian Wynne wrote:

>Furthermore we would like to point out that InvisiLAN technology  has no relation 
>whatsoever with DHCP, for example InvisiLAN changes randomly not just the IP 
>address but also the MAC address and the port numbers.
The InvisiLAN technique is an instance of what I called "interface 
permutation" in this paper:

    "The Cracker Patch Choice: An Analysis of Post Hoc Security
    Techniques".  Crispin Cowan, Heather Hinton, Calton Pu, and Jonathan
    Walpole.  Presented at the National Information Systems Security
    Conference (NISSC) <>, Baltimore MD,
    October 16-19 2000. PDF

The specific approach of IP address hopping was described in this DARPA 

    "Dynamic Approaches to Thwart Adversary Intelligence Gathering
    Doreen Kewley et al, DARPA Information Survivability Conference &
    Expo (DISCEX II), June 12-14, 2001.

>We understand that the claim of unhackability is a steep one but I can assure you 
>that anyone who has tested the system in the past has been swept away by the 
>effectiveness and the implications of this new technology. 
In the DARPA experiment anyway, it turned out to be hackable :) More 
precisely, it imposed a delay on the attacker, but did not stop them. A 
notable difference is that the DARPA experiment only changed the IP 
address, and not the MAC address. I'm not convinced that this will make 
a difference, but it could.


Crispin Cowan, Ph.D. 
Chief Scientist, Immunix

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