From bwatanabe@berkeley.edu Mon Aug 07 10:40:30 1995
Path: ashpoly!cascade!bigsur!berkeley!bwatanabe
From: bwatanabe@berkeley.edu (Bill Watanabe)
Newsgroups: comp.sys.m68k
Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Aug07.104030.2102@berkeley.edu>
Date: Mon, 07 Aug 1995 10:40:30 GMT
Organization: UC Berkeley Department of EECS
NNTP-Posting-Host: berkeley.edu
X-Newsreader: Netscape 1.1N
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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.

Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet.

-- 
Bill Watanabe
Tape trading list upon request. SASE required for international mail.

From hnakamura@berkeley.edu Mon Aug 07 21:00:30 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!hnakamura
From: hnakamura@berkeley.edu (Heather Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Aug07.210030.3456@berkeley.edu>
Date: Mon, 07 Aug 1995 21:00:30 GMT
References: <1995Aug07.104030.2102@berkeley.edu>
Organization: UC Berkeley Department of EECS
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In article <1995Aug07.104030.2102@berkeley.edu>, bwatanabe@berkeley.edu (Bill Watanabe) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
Heather Nakamura
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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From snakamura@panix.com Wed Aug 09 09:06:30 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!snakamura
From: snakamura@panix.com (Steve Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Aug09.090630.7239@panix.com>
Date: Wed, 09 Aug 1995 09:06:30 GMT
References: <1995Aug07.104030.2102@berkeley.edu> <1995Aug07.210030.3456@berkeley.edu>
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995Aug07.210030.3456@berkeley.edu>, hnakamura@berkeley.edu (Heather Nakamura) 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.

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