From gfournier@kth.se Tue Nov 07 04:42:21 1995
Path: ashpoly!cascade!bigsur!kth!gfournier
From: gfournier@kth.se (Graham Fournier)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov07.044221.4087@kth.se>
Date: Tue, 07 Nov 1995 04:42:21 GMT
Organization: Royal Institute of Technology, Stockholm
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.
Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

Did Marcus take the decryption EPROM with him when he left the lab?

-- 
Graham Fournier | gfournier@kth.se
PGP Key fingerprint: 548F 4E2E 8FF4 084B
"Keep the channels open."

From vsantos@cern.ch Tue Nov 07 06:43:21 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!cern!vsantos
From: vsantos@cern.ch (Valeria Santos)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov07.064321.5341@cern.ch>
Date: Tue, 07 Nov 1995 06:43:21 GMT
References: <1995Nov07.044221.4087@kth.se>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1995Nov07.044221.4087@kth.se>, gfournier@kth.se (Graham Fournier) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

-- 
Valeria Santos
Tape trading list upon request. SASE required for international mail.

From akuznetsov@kiae.su Thu Nov 09 10:29:21 1995
Path: ashpoly!cascade!bigsur!kiae!akuznetsov
From: akuznetsov@kiae.su (Astrid Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov09.102921.4449@kiae.su>
Date: Thu, 09 Nov 1995 10:29:21 GMT
References: <1995Nov07.044221.4087@kth.se>
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
X-Newsreader: Netscape 1.1N
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In article <1995Nov07.044221.4087@kth.se>, gfournier@kth.se (Graham Fournier) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him.

-- 
Astrid Kuznetsov -- Kurchatov Institute of Atomic Energy, Moscow
"Marcus is not one man."

From toliveira@delphi.com Sat Nov 11 06:14:21 1995
Path: ashpoly!cascade!bigsur!delphi!toliveira
From: toliveira@delphi.com (Tyler Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov11.061421.1521@delphi.com>
Date: Sat, 11 Nov 1995 06:14:21 GMT
References: <1995Nov07.044221.4087@kth.se> <1995Nov07.064321.5341@cern.ch>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995Nov07.064321.5341@cern.ch>, vsantos@cern.ch (Valeria Santos) writes:
> Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

-- 
Tyler Oliveira
Opinions expressed are solely my own and not those of Delphi Internet Services.
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