From srodriguez@clari.net Fri Dec 01 05:14:44 1995
Path: ashpoly!cascade!transat!ukc!fennimore!clari!srodriguez
From: srodriguez@clari.net (Seo-yeon Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Discussion: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Dec01.051444.3561@clari.net>
Date: Fri, 01 Dec 1995 05:14:44 GMT
Organization: ClariNet Communications Corp
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Hardware disassembly report for Motorola hardware hackers.

Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.
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.

-- 
Seo-yeon Rodríguez
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
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From iokonkwo@rwth-aachen.de Fri Dec 01 22:33:44 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!iokonkwo
From: iokonkwo@rwth-aachen.de (Ines Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Dec01.223344.5052@rwth-aachen.de>
Date: Fri, 01 Dec 1995 22:33:44 GMT
References: <1995Dec01.051444.3561@clari.net>
Organization: RWTH Aachen Informatik
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In article <1995Dec01.051444.3561@clari.net>, srodriguez@clari.net (Seo-yeon Rodríguez) writes:
> Hardware disassembly report for Motorola hardware hackers.
> Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
Ines Okonkwo | iokonkwo@rwth-aachen.de
PGP Key fingerprint: 3461 A8AD 4C4E C62B
"Keep the channels open."

From smacdonald@titech.ac.jp Sat Dec 02 19:40:44 1995
Path: ashpoly!cascade!brgate!saturno!titech!smacdonald
From: smacdonald@titech.ac.jp (Seo-yeon MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Dec02.194044.8009@titech.ac.jp>
Date: Sat, 02 Dec 1995 19:40:44 GMT
References: <1995Dec01.051444.3561@clari.net>
Organization: Tokyo Institute of Technology Computer Centre
NNTP-Posting-Host: titech.ac.jp
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

In article <1995Dec01.051444.3561@clari.net>, srodriguez@clari.net (Seo-yeon Rodríguez) writes:
> Hardware disassembly report for Motorola hardware hackers.
> Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
Seo-yeon MacDonald
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
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