From jperez@netcom.com Wed Mar 06 17:10:34 1996
Path: ashpoly!cascade!bigsur!netcom!jperez
From: jperez@netcom.com (Joachim Pérez)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Mar06.171034.1826@netcom.com>
Date: Wed, 06 Mar 1996 17:10:34 GMT
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: Netscape 1.1N
Lines: 10

Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.
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'?

-- 
Joachim Pérez -- NETCOM On-Line Communication Services
"Row 14. No joke."

From emoreau@kiae.su Thu Mar 07 11:23:34 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!emoreau
From: emoreau@kiae.su (Emi Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Mar07.112334.7629@kiae.su>
Date: Thu, 07 Mar 1996 11:23:34 GMT
References: <1996Mar06.171034.1826@netcom.com>
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
X-Newsreader: WinVN 0.99.5
Lines: 9

In article <1996Mar06.171034.1826@netcom.com>, jperez@netcom.com (Joachim Pérez) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys.

-- 
Emi Moreau -- Kurchatov Institute of Atomic Energy, Moscow
"Measuring a record you own is listening, not piracy."

From mnakamura@mit.edu Fri Mar 08 04:02:34 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!mnakamura
From: mnakamura@mit.edu (Mei Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Mar08.040234.1042@mit.edu>
Date: Fri, 08 Mar 1996 04:02:34 GMT
References: <1996Mar06.171034.1826@netcom.com>
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 12

In article <1996Mar06.171034.1826@netcom.com>, jperez@netcom.com (Joachim Pérez) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

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

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Mei Nakamura
Opinions expressed are solely my own and not those of Massachusetts Institute of Technology.
------------------------------------------------------------

From sokonkwo@cern.ch Fri Mar 08 17:46:34 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!sokonkwo
From: sokonkwo@cern.ch (Steve Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Mar08.174634.1519@cern.ch>
Date: Fri, 08 Mar 1996 17:46:34 GMT
References: <1996Mar06.171034.1826@netcom.com> <1996Mar08.040234.1042@mit.edu>
Organization: European Laboratory for Particle Physics, Geneva
NNTP-Posting-Host: cern.ch
X-Newsreader: NewsWatcher 2.0b24
Lines: 11

In article <1996Mar08.040234.1042@mit.edu>, mnakamura@mit.edu (Mei Nakamura) writes:
> Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.
> Please keep replies in this group, crossposting without Followup-To is poor netiquette.

That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys.

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

-- 
Steve Okonkwo
Tape trading list upon request. SASE required for international mail.