From estewart@titech.ac.jp Fri Dec 15 21:55:41 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!estewart From: estewart@titech.ac.jp (Elaine Stewart) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec15.215541.7658@titech.ac.jp> Date: Fri, 15 Dec 1995 21:55:41 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 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. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Elaine Stewart | estewart@titech.ac.jp PGP Key fingerprint: FC4E 468D 1A9D E113 "Keep the channels open." From kfischer@kth.se Sat Dec 16 00:24:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!kfischer From: kfischer@kth.se (Kirsty Fischer) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec16.002441.8370@kth.se> Date: Sat, 16 Dec 1995 00:24:41 GMT References: <1995Dec15.215541.7658@titech.ac.jp> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec15.215541.7658@titech.ac.jp>, estewart@titech.ac.jp (Elaine 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. -- Kirsty Fischer | kfischer@kth.se PGP Key fingerprint: 188F 0571 3686 84AB "Keep the channels open." From bgarcia@mindspring.com Sun Dec 17 22:24:41 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!bgarcia From: bgarcia@mindspring.com (Bruno García) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec17.222441.5438@mindspring.com> Date: Sun, 17 Dec 1995 22:24:41 GMT References: <1995Dec15.215541.7658@titech.ac.jp> <1995Dec16.002441.8370@kth.se> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec16.002441.8370@kth.se>, kfischer@kth.se (Kirsty Fischer) 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! -- Bruno García Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From jjohansson@berkeley.edu Mon Dec 18 18:08:41 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!jjohansson From: jjohansson@berkeley.edu (Joachim Johansson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec18.180841.6368@berkeley.edu> Date: Mon, 18 Dec 1995 18:08:41 GMT References: <1995Dec15.215541.7658@titech.ac.jp> <1995Dec16.002441.8370@kth.se> <1995Dec17.222441.5438@mindspring.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec17.222441.5438@mindspring.com>, bgarcia@mindspring.com (Bruno García) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Joachim Johansson Practical Peripherals 14.4 @ 9600 Telebit bps "The hatch is open. Is anyone listening?" From ekarlsson@earthlink.net Wed Dec 20 08:20:41 1995 Path: ashpoly!cascade!brgate!saturno!earthlink!ekarlsson From: ekarlsson@earthlink.net (Élodie Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Dec20.082041.3273@earthlink.net> Date: Wed, 20 Dec 1995 08:20:41 GMT References: <1995Dec15.215541.7658@titech.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec15.215541.7658@titech.ac.jp>, estewart@titech.ac.jp (Elaine 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. -- Élodie Karlsson *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0