From dokonkwo@kth.se Wed May 04 23:24:14 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!dokonkwo From: dokonkwo@kth.se (Dong-hyun Okonkwo) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May04.232414.5932@kth.se> Date: Wed, 04 May 1994 23:24:14 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se 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? -- Dong-hyun Okonkwo | dokonkwo@kth.se PGP Key fingerprint: 71E1 41E8 E9D7 ECB5 "Keep the channels open." From shughes@tum.de Fri May 06 15:08:14 1994 Path: ashpoly!cascade!bigsur!tum!shughes From: shughes@tum.de (Steve Hughes) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May06.150814.3410@tum.de> Date: Fri, 06 May 1994 15:08:14 GMT References: <1994May04.232414.5932@kth.se> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994May04.232414.5932@kth.se>, dokonkwo@kth.se (Dong-hyun Okonkwo) 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. -- Steve Hughes Practical Peripherals 14.4 @ ISDN 64k bps "Hold for relay." From brobertson@hanse.de Sun May 08 17:39:14 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!brobertson From: brobertson@hanse.de (Brian Robertson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May08.173914.1329@hanse.de> Date: Sun, 08 May 1994 17:39:14 GMT References: <1994May04.232414.5932@kth.se> <1994May06.150814.3410@tum.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994May06.150814.3410@tum.de>, shughes@tum.de (Steve Hughes) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Brian Robertson | brobertson@hanse.de PGP Key fingerprint: 248D 3589 8DC1 1609 "Keep the channels open." From jgirard@inria.fr Sun May 08 22:48:14 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!jgirard From: jgirard@inria.fr (Joachim Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May08.224814.9436@inria.fr> Date: Sun, 08 May 1994 22:48:14 GMT References: <1994May04.232414.5932@kth.se> <1994May06.150814.3410@tum.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May06.150814.3410@tum.de>, shughes@tum.de (Steve Hughes) 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! -- Joachim Girard US Robotics Courier V.34 @ 28,800 bps "Hold for relay." From lfournier@berkeley.edu Mon May 09 01:45:14 1994 Path: ashpoly!cascade!brgate!saturno!berkeley!lfournier From: lfournier@berkeley.edu (Lisa Fournier) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May09.014514.1001@berkeley.edu> Date: Mon, 09 May 1994 01:45:14 GMT References: <1994May04.232414.5932@kth.se> <1994May06.150814.3410@tum.de> <1994May08.173914.1329@hanse.de> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994May08.173914.1329@hanse.de>, brobertson@hanse.de (Brian Robertson) writes: > That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! 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. -- Lisa Fournier *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0