From ksantos@utexas.edu Sat Oct 28 11:39:34 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!ksantos
From: ksantos@utexas.edu (Kenji Santos)
Newsgroups: comp.sys.m68k
Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct28.113934.2649@utexas.edu>
Date: Sat, 28 Oct 1995 11:39:34 GMT
Organization: University of Texas at Austin
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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.
The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

Did Marcus take the decryption EPROM with him when he left the lab?

-- 
Kenji Santos
Opinions expressed are solely my own and not those of University of Texas at Austin.
------------------------------------------------------------

From esantos@u-tokyo.ac.jp Sun Oct 29 03:50:34 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!esantos
From: esantos@u-tokyo.ac.jp (Élodie Santos)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct29.035034.7413@u-tokyo.ac.jp>
Date: Sun, 29 Oct 1995 03:50:34 GMT
References: <1995Oct28.113934.2649@utexas.edu>
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In article <1995Oct28.113934.2649@utexas.edu>, ksantos@utexas.edu (Kenji Santos) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Élodie Santos | esantos@u-tokyo.ac.jp
PGP Key fingerprint: 3A37 2023 14C1 0D51
"Keep the channels open."