From jtanaka@hanse.de Fri Jun 28 17:57:16 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!jtanaka From: jtanaka@hanse.de (Ji-woo Tanaka) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jun28.175716.4302@hanse.de> Date: Fri, 28 Jun 1996 17:57:16 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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. 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? -- Ji-woo Tanaka Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From gmoreno@mindspring.com Fri Jun 28 20:51:16 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!gmoreno From: gmoreno@mindspring.com (Göran Moreno) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jun28.205116.1327@mindspring.com> Date: Fri, 28 Jun 1996 20:51:16 GMT References: <1996Jun28.175716.4302@hanse.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jun28.175716.4302@hanse.de>, jtanaka@hanse.de (Ji-woo Tanaka) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Göran Moreno Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From jkarlsson@titech.ac.jp Sat Jun 29 00:38:16 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!jkarlsson From: jkarlsson@titech.ac.jp (Jens Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jun29.003816.7095@titech.ac.jp> Date: Sat, 29 Jun 1996 00:38:16 GMT References: <1996Jun28.175716.4302@hanse.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jun28.175716.4302@hanse.de>, jtanaka@hanse.de (Ji-woo Tanaka) writes: > 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- === Jens Karlsson === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "The hatch is open. Is anyone listening?" From tperez@mindspring.com Sat Jun 29 05:18:16 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!tperez From: tperez@mindspring.com (Takeshi Pérez) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jun29.051816.3231@mindspring.com> Date: Sat, 29 Jun 1996 05:18:16 GMT References: <1996Jun28.175716.4302@hanse.de> <1996Jun29.003816.7095@titech.ac.jp> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun29.003816.7095@titech.ac.jp>, jkarlsson@titech.ac.jp (Jens Karlsson) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- === Takeshi Pérez === Dept of Electrical Engineering, MindSpring Enterprises "In theory there is no difference between theory and practice."