From ghughes@clari.net Tue Feb 06 03:49:38 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!clari!ghughes
From: ghughes@clari.net (Graham Hughes)
Newsgroups: comp.sys.m68k
Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Feb06.034938.8203@clari.net>
Date: Tue, 06 Feb 1996 03:49:38 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.

Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'?

-- 
Graham Hughes <ghughes@clari.net>
"Tape doesn't lie at 02:14. Ears do."
Decstation 5000/200 / AmigaOS 3.1

From jandersson@kiae.su Wed Feb 07 08:52:38 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!jandersson
From: jandersson@kiae.su (Joachim Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Feb07.085238.6755@kiae.su>
Date: Wed, 07 Feb 1996 08:52:38 GMT
References: <1996Feb06.034938.8203@clari.net>
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
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In article <1996Feb06.034938.8203@clari.net>, ghughes@clari.net (Graham Hughes) writes:
> Hardware disassembly report for Motorola hardware hackers.

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

-- 
Joachim Andersson
Tape trading list upon request. SASE required for international mail.