From dnovak@illinois.edu Thu Jun 23 04:05:25 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!dnovak
From: dnovak@illinois.edu (Diego Novak)
Newsgroups: comp.sys.m68k
Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jun23.040525.1143@illinois.edu>
Date: Thu, 23 Jun 1994 04:05:25 GMT
Organization: University of Illinois Urbana-Champaign
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Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

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.

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

-- 
Diego Novak | dnovak@illinois.edu
PGP Key fingerprint: 2573 52AC BF74 06AF
"Keep the channels open."

From pmacdonald@mindspring.com Fri Jun 24 16:59:25 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!pmacdonald
From: pmacdonald@mindspring.com (Pavel MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jun24.165925.6989@mindspring.com>
Date: Fri, 24 Jun 1994 16:59:25 GMT
References: <1994Jun23.040525.1143@illinois.edu>
Organization: MindSpring Enterprises
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In article <1994Jun23.040525.1143@illinois.edu>, dnovak@illinois.edu (Diego Novak) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> 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.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Pavel MacDonald
Tape trading list upon request. SASE required for international mail.

From anilsson@uu.net Sun Jun 26 14:12:25 1994
Path: ashpoly!cascade!mxgate!coyoacan!uu!anilsson
From: anilsson@uu.net (Amy Nilsson)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jun26.141225.3024@uu.net>
Date: Sun, 26 Jun 1994 14:12:25 GMT
References: <1994Jun23.040525.1143@illinois.edu> <1994Jun24.165925.6989@mindspring.com>
Organization: UUNET Technologies, Falls Church VA
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In article <1994Jun24.165925.6989@mindspring.com>, pmacdonald@mindspring.com (Pavel MacDonald) writes:
> Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him.
> Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

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

-- 
Amy Nilsson
Tape trading list upon request. SASE required for international mail.

From atanaka@berkeley.edu Tue Jun 28 05:23:25 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!atanaka
From: atanaka@berkeley.edu (Aiko Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jun28.052325.6722@berkeley.edu>
Date: Tue, 28 Jun 1994 05:23:25 GMT
References: <1994Jun23.040525.1143@illinois.edu> <1994Jun24.165925.6989@mindspring.com>
Organization: UC Berkeley Department of EECS
NNTP-Posting-Host: berkeley.edu
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In article <1994Jun24.165925.6989@mindspring.com>, pmacdonald@mindspring.com (Pavel MacDonald) writes:
> Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
=== Aiko Tanaka ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"Hardware is temporary. The signal survives."