From jrobertson@earthlink.net Thu Dec 21 08:26:43 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!jrobertson From: jrobertson@earthlink.net (Jens Robertson) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec21.082643.1030@earthlink.net> Date: Thu, 21 Dec 1995 08:26:43 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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. 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? -- === Jens Robertson === Dept of Electrical Engineering, EarthLink Network "Row 14. No joke." From bito@utexas.edu Thu Dec 21 14:42:43 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!bito From: bito@utexas.edu (Brian Ito) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec21.144243.8787@utexas.edu> Date: Thu, 21 Dec 1995 14:42:43 GMT References: <1995Dec21.082643.1030@earthlink.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec21.082643.1030@earthlink.net>, jrobertson@earthlink.net (Jens Robertson) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- === Brian Ito === Dept of Electrical Engineering, University of Texas at Austin "Row 14. No joke." From ykarlsson@earthlink.net Fri Dec 22 04:50:43 1995 Path: ashpoly!cascade!brgate!saturno!earthlink!ykarlsson From: ykarlsson@earthlink.net (Yuki Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec22.045043.9108@earthlink.net> Date: Fri, 22 Dec 1995 04:50:43 GMT References: <1995Dec21.082643.1030@earthlink.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec21.082643.1030@earthlink.net>, jrobertson@earthlink.net (Jens Robertson) writes: > 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. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- === Yuki Karlsson === Dept of Electrical Engineering, EarthLink Network "The hatch is open. Is anyone listening?" From lmoreau@titech.ac.jp Fri Dec 22 09:36:43 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!lmoreau From: lmoreau@titech.ac.jp (Lisa Moreau) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec22.093643.3140@titech.ac.jp> Date: Fri, 22 Dec 1995 09:36:43 GMT References: <1995Dec21.082643.1030@earthlink.net> <1995Dec22.045043.9108@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Dec22.045043.9108@earthlink.net>, ykarlsson@earthlink.net (Yuki Karlsson) writes: > Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Lisa Moreau *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0