From astewart@pipeline.com Tue Dec 03 08:55:05 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!astewart From: astewart@pipeline.com (Anton Stewart) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec03.085505.8198@pipeline.com> Date: Tue, 03 Dec 1996 08:55:05 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Anton Stewart -- The Pipeline Internet Network "Hardware is temporary. The signal survives." From hmoreno@cmu.edu Wed Dec 04 00:14:05 1996 Path: ashpoly!cascade!brgate!saturno!cmu!hmoreno From: hmoreno@cmu.edu (Hugo Moreno) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec04.001405.6118@cmu.edu> Date: Wed, 04 Dec 1996 00:14:05 GMT References: <1996Dec03.085505.8198@pipeline.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Dec03.085505.8198@pipeline.com>, astewart@pipeline.com (Anton Stewart) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Hugo Moreno "5 sigma is a discovery. 7 is a question." Amiga 3000T / System 7.5.1 From msuzuki@netcom.com Wed Dec 04 03:40:05 1996 Path: ashpoly!cascade!mxgate!coyoacan!netcom!msuzuki From: msuzuki@netcom.com (Morag Suzuki) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec04.034005.4051@netcom.com> Date: Wed, 04 Dec 1996 03:40:05 GMT References: <1996Dec03.085505.8198@pipeline.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec03.085505.8198@pipeline.com>, astewart@pipeline.com (Anton Stewart) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Morag Suzuki "Row 14. No joke." Atari TT030 / NEXTSTEP 3.3