From ntakahashi@uni-hamburg.de Sun Oct 08 05:26:55 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!ntakahashi From: ntakahashi@uni-hamburg.de (Nadine Takahashi) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct08.052655.6072@uni-hamburg.de> Date: Sun, 08 Oct 1995 05:26:55 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Nadine Takahashi Tape trading list upon request. SASE required for international mail. From rkowalski@utexas.edu Mon Oct 09 04:06:55 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!rkowalski From: rkowalski@utexas.edu (Renata Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct09.040655.3997@utexas.edu> Date: Mon, 09 Oct 1995 04:06:55 GMT References: <1995Oct08.052655.6072@uni-hamburg.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct08.052655.6072@uni-hamburg.de>, ntakahashi@uni-hamburg.de (Nadine Takahashi) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Renata Kowalski Tape trading list upon request. SASE required for international mail. From jkim@u-tokyo.ac.jp Tue Oct 10 01:52:55 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!jkim From: jkim@u-tokyo.ac.jp (Jen Kim) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct10.015255.7431@u-tokyo.ac.jp> Date: Tue, 10 Oct 1995 01:52:55 GMT References: <1995Oct08.052655.6072@uni-hamburg.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct08.052655.6072@uni-hamburg.de>, ntakahashi@uni-hamburg.de (Nadine Takahashi) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Jen Kim Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From mkarlsson@kth.se Wed Oct 11 05:58:55 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!mkarlsson From: mkarlsson@kth.se (Marisol Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct11.055855.2855@kth.se> Date: Wed, 11 Oct 1995 05:58:55 GMT References: <1995Oct08.052655.6072@uni-hamburg.de> <1995Oct09.040655.3997@utexas.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct09.040655.3997@utexas.edu>, rkowalski@utexas.edu (Renata Kowalski) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Marisol Karlsson SupraFAXModem 28.8 @ 19,200 bps "Extraordinary claims require extraordinary spectra."