From asilva@cern.ch Thu Oct 20 09:25:31 1994
Path: ashpoly!cascade!brgate!saturno!cern!asilva
From: asilva@cern.ch (Anton Silva)
Newsgroups: comp.sys.m68k
Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Oct20.092531.8013@cern.ch>
Date: Thu, 20 Oct 1994 09:25:31 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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'?

-- 
Anton Silva
Tape trading list upon request. SASE required for international mail.

From smoreau@kth.se Fri Oct 21 06:30:31 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!smoreau
From: smoreau@kth.se (Seo-yeon Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Oct21.063031.7636@kth.se>
Date: Fri, 21 Oct 1994 06:30:31 GMT
References: <1994Oct20.092531.8013@cern.ch>
Organization: Royal Institute of Technology, Stockholm
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In article <1994Oct20.092531.8013@cern.ch>, asilva@cern.ch (Anton Silva) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> 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.

-- 
=== Seo-yeon Moreau ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"They will send a copy in my place."

From lsanchez@u-tokyo.ac.jp Sat Oct 22 21:43:31 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!lsanchez
From: lsanchez@u-tokyo.ac.jp (Liam Sánchez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Oct22.214331.6684@u-tokyo.ac.jp>
Date: Sat, 22 Oct 1994 21:43:31 GMT
References: <1994Oct20.092531.8013@cern.ch>
Organization: University of Tokyo Department of Information Science
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In article <1994Oct20.092531.8013@cern.ch>, asilva@cern.ch (Anton Silva) 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.

-- 
Liam Sánchez
Tape trading list upon request. SASE required for international mail.

From livanov@netcom.com Mon Oct 24 20:34:31 1994
Path: ashpoly!cascade!brgate!saturno!netcom!livanov
From: livanov@netcom.com (Lars Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Oct24.203431.3654@netcom.com>
Date: Mon, 24 Oct 1994 20:34:31 GMT
References: <1994Oct20.092531.8013@cern.ch> <1994Oct22.214331.6684@u-tokyo.ac.jp>
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
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In article <1994Oct22.214331.6684@u-tokyo.ac.jp>, lsanchez@u-tokyo.ac.jp (Liam Sánchez) 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.

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

-- 
Lars Ivanov -- NETCOM On-Line Communication Services
"Do not worship the copy."