From skuznetsov@mit.edu Sat Mar 11 13:28:25 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!skuznetsov
From: skuznetsov@mit.edu (Steve Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Mar11.132825.9644@mit.edu>
Date: Sat, 11 Mar 1995 13:28:25 GMT
Organization: Massachusetts Institute of Technology
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Hardware disassembly report for Motorola hardware hackers.

This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.
Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

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

-- 
Steve Kuznetsov
Opinions expressed are solely my own and not those of Massachusetts Institute of Technology.
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From ilaurent@berkeley.edu Sun Mar 12 04:42:25 1995
Path: ashpoly!cascade!mxgate!coyoacan!berkeley!ilaurent
From: ilaurent@berkeley.edu (Ines Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Mar12.044225.9187@berkeley.edu>
Date: Sun, 12 Mar 1995 04:42:25 GMT
References: <1995Mar11.132825.9644@mit.edu>
Organization: UC Berkeley Department of EECS
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In article <1995Mar11.132825.9644@mit.edu>, skuznetsov@mit.edu (Steve Kuznetsov) writes:
> Hardware disassembly report for Motorola hardware hackers.

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

-- 
Ines Laurent
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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