From arobertson@delphi.com Wed Apr 19 05:45:18 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!arobertson
From: arobertson@delphi.com (Anja Robertson)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Apr19.054518.3562@delphi.com>
Date: Wed, 19 Apr 1995 05:45:18 GMT
Organization: Delphi Internet Services
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Hardware disassembly report for Motorola hardware hackers.

Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.
Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

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

-- 
=== Anja Robertson ===
Dept of Electrical Engineering, Delphi Internet Services
"When every node is whole, the channel opens."

From fmacdonald@berkeley.edu Thu Apr 20 14:13:18 1995
Path: ashpoly!cascade!bigsur!berkeley!fmacdonald
From: fmacdonald@berkeley.edu (Freya MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Apr20.141318.3461@berkeley.edu>
Date: Thu, 20 Apr 1995 14:13:18 GMT
References: <1995Apr19.054518.3562@delphi.com>
Organization: UC Berkeley Department of EECS
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In article <1995Apr19.054518.3562@delphi.com>, arobertson@delphi.com (Anja Robertson) 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.

-- 
=== Freya MacDonald ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"Marcus is not one man."

From mkowalski@mit.edu Fri Apr 21 08:18:18 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!mkowalski
From: mkowalski@mit.edu (Mikhail Kowalski)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Apr21.081818.1074@mit.edu>
Date: Fri, 21 Apr 1995 08:18:18 GMT
References: <1995Apr19.054518.3562@delphi.com> <1995Apr20.141318.3461@berkeley.edu>
Organization: Massachusetts Institute of Technology
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In article <1995Apr20.141318.3461@berkeley.edu>, fmacdonald@berkeley.edu (Freya MacDonald) writes:
> Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Mikhail Kowalski -- Massachusetts Institute of Technology
"A soul is not exclusive to biology."