From apopov@kiae.su Mon Jan 10 18:05:37 1994
Path: ashpoly!cascade!bigsur!kiae!apopov
From: apopov@kiae.su (Anton Popov)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jan10.180537.1933@kiae.su>
Date: Mon, 10 Jan 1994 18:05:37 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.
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 Popov
Tape trading list upon request. SASE required for international mail.

From skang@panix.com Wed Jan 12 03:07:37 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!skang
From: skang@panix.com (Steve Kang)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jan12.030737.5251@panix.com>
Date: Wed, 12 Jan 1994 03:07:37 GMT
References: <1994Jan10.180537.1933@kiae.su>
Organization: Public Access Unix of New York
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In article <1994Jan10.180537.1933@kiae.su>, apopov@kiae.su (Anton Popov) 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.

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

-- 
Steve Kang
Opinions expressed are solely my own and not those of Public Access Unix of New York.
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