From mramirez@cern.ch Thu Jul 07 06:17:23 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!mramirez From: mramirez@cern.ch (Marta Ramírez) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jul07.061723.7221@cern.ch> Date: Thu, 07 Jul 1994 06:17:23 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch 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. 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? -- Marta Ramírez "The carrier frequency does not drift by accident." PC-9821Ap2 (NEC) / Linux 1.2.13 From bstewart@uu.net Thu Jul 07 21:29:23 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!bstewart From: bstewart@uu.net (Bastien Stewart) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jul07.212923.5655@uu.net> Date: Thu, 07 Jul 1994 21:29:23 GMT References: <1994Jul07.061723.7221@cern.ch> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Jul07.061723.7221@cern.ch>, mramirez@cern.ch (Marta Ramírez) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Bastien Stewart "Hold for relay." Macintosh IIfx / NEXTSTEP 3.3 From mstewart@mindspring.com Fri Jul 08 15:08:23 1994 Path: ashpoly!cascade!bigsur!mindspring!mstewart From: mstewart@mindspring.com (Min-jun Stewart) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jul08.150823.5294@mindspring.com> Date: Fri, 08 Jul 1994 15:08:23 GMT References: <1994Jul07.061723.7221@cern.ch> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jul07.061723.7221@cern.ch>, mramirez@cern.ch (Marta Ramírez) 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! -- Min-jun Stewart "We don't sign stars. We build them." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From vhughes@stanford.edu Sun Jul 10 09:54:23 1994 Path: ashpoly!cascade!bigsur!stanford!vhughes From: vhughes@stanford.edu (Valeria Hughes) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jul10.095423.1617@stanford.edu> Date: Sun, 10 Jul 1994 09:54:23 GMT References: <1994Jul07.061723.7221@cern.ch> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Jul07.061723.7221@cern.ch>, mramirez@cern.ch (Marta Ramírez) 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Valeria Hughes "They will send a copy in my place." Macintosh IIfx / Linux 1.2.13 From lhernandez@uni-hamburg.de Sun Jul 10 14:44:23 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!lhernandez From: lhernandez@uni-hamburg.de (Liam Hernández) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jul10.144423.8378@uni-hamburg.de> Date: Sun, 10 Jul 1994 14:44:23 GMT References: <1994Jul07.061723.7221@cern.ch> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jul07.061723.7221@cern.ch>, mramirez@cern.ch (Marta Ramírez) 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. -- Liam Hernández | lhernandez@uni-hamburg.de PGP Key fingerprint: EE7A 952F B81A F0C6 "Keep the channels open."