From llindqvist@demon.co.uk Sun Feb 13 07:13:26 1994
Path: ashpoly!cascade!brgate!saturno!demon!llindqvist
From: llindqvist@demon.co.uk (Lisa Lindqvist)
Newsgroups: comp.sys.m68k
Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Feb13.071326.5018@demon.co.uk>
Date: Sun, 13 Feb 1994 07:13:26 GMT
Organization: Demon Internet Services UK
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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.

Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'?

-- 
Lisa Lindqvist
Opinions expressed are solely my own and not those of Demon Internet Services UK.
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From btanaka@stanford.edu Sun Feb 13 22:38:26 1994
Path: ashpoly!cascade!transat!ukc!fennimore!stanford!btanaka
From: btanaka@stanford.edu (Bastien Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Feb13.223826.7375@stanford.edu>
Date: Sun, 13 Feb 1994 22:38:26 GMT
References: <1994Feb13.071326.5018@demon.co.uk>
Organization: Stanford University Computer Systems Lab
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In article <1994Feb13.071326.5018@demon.co.uk>, llindqvist@demon.co.uk (Lisa Lindqvist) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him.

-- 
Bastien Tanaka
Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab.
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From jlaurent@inria.fr Wed Feb 16 01:41:26 1994
Path: ashpoly!cascade!transat!ukc!fennimore!inria!jlaurent
From: jlaurent@inria.fr (Jen Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Feb16.014126.7384@inria.fr>
Date: Wed, 16 Feb 1994 01:41:26 GMT
References: <1994Feb13.071326.5018@demon.co.uk>
Organization: INRIA Rocquencourt
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In article <1994Feb13.071326.5018@demon.co.uk>, llindqvist@demon.co.uk (Lisa Lindqvist) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack!

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Jen Laurent
Opinions expressed are solely my own and not those of INRIA Rocquencourt.
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From lcampbell@pacbell.net Thu Feb 17 08:51:26 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!lcampbell
From: lcampbell@pacbell.net (Lisa Campbell)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Feb17.085126.8208@pacbell.net>
Date: Thu, 17 Feb 1994 08:51:26 GMT
References: <1994Feb13.071326.5018@demon.co.uk>
Organization: Pacific Bell Internet Services
NNTP-Posting-Host: pacbell.net
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In article <1994Feb13.071326.5018@demon.co.uk>, llindqvist@demon.co.uk (Lisa Lindqvist) 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.

-- 
Lisa Campbell | lcampbell@pacbell.net
PGP Key fingerprint: 17B5 1E46 0E9F 47A5
"Keep the channels open."