From: Derek Atkins <warlord@MIT.EDU>
Date: Mon, 6 Jun 94 09:47:24 PDT
To: jp@jep.pld.ttu.ee (Jyri Poldre)
Subject: Re: Clipper LEAF simulator chip???
In-Reply-To: <9406061244.AA03192@jep.pld.ttu.ee>
Message-ID: <9406061647.AA00259@squeamish-ossifrage.mit.edu>
MIME-Version: 1.0
Content-Type: text/plain


> As far asi I know there has been no direct info about how the checksum
> is calculated, only that it is somehow connected to IV.

According to the NSA talk at MIT last week, the "checksum" is formed
by taking a 16-bit, fixed number (fixed in all chips) and encrypting
it with the session key via some special form of skipjack. 

-derek

         Derek Atkins, SB '93 MIT EE, G MIT Media Laboratory
       Member, MIT Student Information Processing Board (SIPB)
    Home page: http://www.mit.edu:8001/people/warlord/home_page.html
       warlord@MIT.EDU    PP-ASEL     N1NWH    PGP key available