From iokonkwo@pacbell.net Sun Apr 03 00:08:07 1994
Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!iokonkwo
From: iokonkwo@pacbell.net (Ines Okonkwo)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Apr03.000807.2449@pacbell.net>
Date: Sun, 03 Apr 1994 00:08:07 GMT
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Hardware disassembly report for Motorola hardware hackers.

The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.
This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

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

-- 
Ines Okonkwo <iokonkwo@pacbell.net>
"Hardware is temporary. The signal survives."
Amiga 3000T / SunOS 4.1.4

From gtakahashi@netcom.com Mon Apr 04 11:31:07 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!gtakahashi
From: gtakahashi@netcom.com (Graham Takahashi)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Apr04.113107.5394@netcom.com>
Date: Mon, 04 Apr 1994 11:31:07 GMT
References: <1994Apr03.000807.2449@pacbell.net>
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In article <1994Apr03.000807.2449@pacbell.net>, iokonkwo@pacbell.net (Ines Okonkwo) 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.

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

-- 
Graham Takahashi
Tape trading list upon request. SASE required for international mail.