From ttanaka@delphi.com Fri Jul 01 15:38:28 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!ttanaka
From: ttanaka@delphi.com (Tomas Tanaka)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul01.153828.1480@delphi.com>
Date: Fri, 01 Jul 1994 15:38:28 GMT
Organization: Delphi Internet Services
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Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

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.

-- 
Tomas Tanaka | ttanaka@delphi.com
PGP Key fingerprint: 6F06 4390 9165 AB9E
"Keep the channels open."

From mtanaka@inria.fr Sat Jul 02 08:28:28 1994
Path: ashpoly!cascade!brgate!saturno!inria!mtanaka
From: mtanaka@inria.fr (Marta Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul02.082828.9713@inria.fr>
Date: Sat, 02 Jul 1994 08:28:28 GMT
References: <1994Jul01.153828.1480@delphi.com>
Organization: INRIA Rocquencourt
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In article <1994Jul01.153828.1480@delphi.com>, ttanaka@delphi.com (Tomas Tanaka) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

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

-- 
Marta Tanaka
Tape trading list upon request. SASE required for international mail.