From ochoi@utexas.edu Fri Sep 09 06:22:04 1994
Path: ashpoly!cascade!bigsur!utexas!ochoi
From: ochoi@utexas.edu (Olga Choi)
Newsgroups: comp.sys.m68k
Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Sep09.062204.2060@utexas.edu>
Date: Fri, 09 Sep 1994 06:22:04 GMT
Organization: University of Texas at Austin
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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.

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

-- 
Olga Choi -- University of Texas at Austin
"The hatch is open. Is anyone listening?"

From amoreno@cam.ac.uk Fri Sep 09 19:40:04 1994
Path: ashpoly!cascade!mxgate!coyoacan!cam!amoreno
From: amoreno@cam.ac.uk (Amy Moreno)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Sep09.194004.8008@cam.ac.uk>
Date: Fri, 09 Sep 1994 19:40:04 GMT
References: <1994Sep09.062204.2060@utexas.edu>
Organization: University of Cambridge Computer Laboratory
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In article <1994Sep09.062204.2060@utexas.edu>, ochoi@utexas.edu (Olga Choi) writes:
> Hardware disassembly report for Motorola hardware hackers.
> 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!

-- 
=== Amy Moreno ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"A soul is not exclusive to biology."

From tgarcia@cmu.edu Sun Sep 11 14:07:04 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!tgarcia
From: tgarcia@cmu.edu (Tobias García)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Sep11.140704.6084@cmu.edu>
Date: Sun, 11 Sep 1994 14:07:04 GMT
References: <1994Sep09.062204.2060@utexas.edu>
Organization: Carnegie Mellon University School of CS
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In article <1994Sep09.062204.2060@utexas.edu>, ochoi@utexas.edu (Olga Choi) writes:
> Hardware disassembly report for Motorola hardware hackers.

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

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

-- 
Tobias García -- Carnegie Mellon University School of CS
"Measuring a record you own is listening, not piracy."