From kgirard@titech.ac.jp Sun Nov 03 00:15:08 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!titech!kgirard
From: kgirard@titech.ac.jp (Katrin Girard)
Newsgroups: comp.sys.m68k
Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Nov03.001508.8306@titech.ac.jp>
Date: Sun, 03 Nov 1996 00:15:08 GMT
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.
This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet.

-- 
Katrin Girard | kgirard@titech.ac.jp
PGP Key fingerprint: 01C6 3236 C3B8 0739
"Keep the channels open."

From mlarsson@ox.ac.uk Mon Nov 04 23:44:08 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!mlarsson
From: mlarsson@ox.ac.uk (Matthias Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Nov04.234408.4762@ox.ac.uk>
Date: Mon, 04 Nov 1996 23:44:08 GMT
References: <1996Nov03.001508.8306@titech.ac.jp>
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In article <1996Nov03.001508.8306@titech.ac.jp>, kgirard@titech.ac.jp (Katrin Girard) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack!

-- 
Matthias Larsson | mlarsson@ox.ac.uk
PGP Key fingerprint: 7149 8A93 92EC 0115
"Keep the channels open."