From iito@unam.mx Sun Jan 09 23:51:37 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!iito From: iito@unam.mx (Ines Ito) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan09.235137.5878@unam.mx> Date: Sun, 09 Jan 1994 23:51:37 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx 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. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Ines Ito | iito@unam.mx PGP Key fingerprint: 9DBF BBE3 F437 A9E2 "Keep the channels open." From lgonzalez@titech.ac.jp Mon Jan 10 08:08:37 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!lgonzalez From: lgonzalez@titech.ac.jp (Lucia González) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan10.080837.6182@titech.ac.jp> Date: Mon, 10 Jan 1994 08:08:37 GMT References: <1994Jan09.235137.5878@unam.mx> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Jan09.235137.5878@unam.mx>, iito@unam.mx (Ines Ito) 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. -- Lucia González | lgonzalez@titech.ac.jp PGP Key fingerprint: D3F2 ECB9 28F9 B5F2 "Keep the channels open." From rhughes@berkeley.edu Tue Jan 11 08:39:37 1994 Path: ashpoly!cascade!brgate!saturno!berkeley!rhughes From: rhughes@berkeley.edu (Raj Hughes) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan11.083937.9599@berkeley.edu> Date: Tue, 11 Jan 1994 08:39:37 GMT References: <1994Jan09.235137.5878@unam.mx> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan09.235137.5878@unam.mx>, iito@unam.mx (Ines Ito) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. If you are posting from AOL, please read RFC 1036 before posting again. -- Raj Hughes -- UC Berkeley Department of EECS "Row 14. No joke." From hmoreau@kth.se Thu Jan 13 09:10:37 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!hmoreau From: hmoreau@kth.se (Heather Moreau) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan13.091037.6195@kth.se> Date: Thu, 13 Jan 1994 09:10:37 GMT References: <1994Jan09.235137.5878@unam.mx> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Jan09.235137.5878@unam.mx>, iito@unam.mx (Ines Ito) 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! -- Heather Moreau Tape trading list upon request. SASE required for international mail. From tkang@cam.ac.uk Thu Jan 13 16:14:37 1994 Path: ashpoly!cascade!brgate!saturno!cam!tkang From: tkang@cam.ac.uk (Tobias Kang) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan13.161437.1154@cam.ac.uk> Date: Thu, 13 Jan 1994 16:14:37 GMT References: <1994Jan09.235137.5878@unam.mx> <1994Jan11.083937.9599@berkeley.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jan11.083937.9599@berkeley.edu>, rhughes@berkeley.edu (Raj Hughes) writes: > Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Tobias Kang Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------