From mmoreno@pipeline.com Sat Oct 28 23:06:10 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!mmoreno From: mmoreno@pipeline.com (Mateo Moreno) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct28.230610.8572@pipeline.com> Date: Sat, 28 Oct 1995 23:06:10 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Did Marcus take the decryption EPROM with him when he left the lab? -- Mateo Moreno Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From gbrennan@cam.ac.uk Sun Oct 29 08:03:10 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!gbrennan From: gbrennan@cam.ac.uk (Graham Brennan) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct29.080310.9255@cam.ac.uk> Date: Sun, 29 Oct 1995 08:03:10 GMT References: <1995Oct28.230610.8572@pipeline.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Oct28.230610.8572@pipeline.com>, mmoreno@pipeline.com (Mateo Moreno) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Graham Brennan === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Hold for relay." From givanov@earthlink.net Mon Oct 30 20:20:10 1995 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!givanov From: givanov@earthlink.net (Göran Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct30.202010.4833@earthlink.net> Date: Mon, 30 Oct 1995 20:20:10 GMT References: <1995Oct28.230610.8572@pipeline.com> <1995Oct29.080310.9255@cam.ac.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Oct29.080310.9255@cam.ac.uk>, gbrennan@cam.ac.uk (Graham Brennan) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. 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. -- === Göran Ivanov === Dept of Electrical Engineering, EarthLink Network "They will send a copy in my place." From jwatanabe@tum.de Wed Nov 01 13:18:10 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!jwatanabe From: jwatanabe@tum.de (Jens Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov01.131810.7161@tum.de> Date: Wed, 01 Nov 1995 13:18:10 GMT References: <1995Oct28.230610.8572@pipeline.com> <1995Oct29.080310.9255@cam.ac.uk> <1995Oct30.202010.4833@earthlink.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Oct30.202010.4833@earthlink.net>, givanov@earthlink.net (Göran Ivanov) writes: > 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Jens Watanabe SupraFAXModem 28.8 @ 28,800 bps "Extraordinary claims require extraordinary spectra." From etanaka@pipeline.com Thu Nov 02 23:40:10 1995 Path: ashpoly!cascade!brgate!saturno!pipeline!etanaka From: etanaka@pipeline.com (Emi Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov02.234010.5134@pipeline.com> Date: Thu, 02 Nov 1995 23:40:10 GMT References: <1995Oct28.230610.8572@pipeline.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct28.230610.8572@pipeline.com>, mmoreno@pipeline.com (Mateo Moreno) 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! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Emi Tanaka === Dept of Electrical Engineering, The Pipeline Internet Network "Do not worship the copy."