From tbrennan@pacbell.net Tue Apr 25 00:39:19 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!tbrennan From: tbrennan@pacbell.net (Tyler Brennan) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr25.003919.1947@pacbell.net> Date: Tue, 25 Apr 1995 00:39:19 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- === Tyler Brennan === Dept of Electrical Engineering, Pacific Bell Internet Services "Hardware is temporary. The signal survives." From msilva@mit.edu Tue Apr 25 20:20:19 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!msilva From: msilva@mit.edu (Morag Silva) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr25.202019.1833@mit.edu> Date: Tue, 25 Apr 1995 20:20:19 GMT References: <1995Apr25.003919.1947@pacbell.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr25.003919.1947@pacbell.net>, tbrennan@pacbell.net (Tyler Brennan) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Morag Silva -- Massachusetts Institute of Technology "Extraordinary claims require extraordinary spectra." From asato@panix.com Thu Apr 27 04:44:19 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!asato From: asato@panix.com (Anton Sato) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr27.044419.1093@panix.com> Date: Thu, 27 Apr 1995 04:44:19 GMT References: <1995Apr25.003919.1947@pacbell.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Apr25.003919.1947@pacbell.net>, tbrennan@pacbell.net (Tyler Brennan) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Anton Sato *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From apetrov@tum.de Fri Apr 28 10:06:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!apetrov From: apetrov@tum.de (Astrid Petrov) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr28.100619.2327@tum.de> Date: Fri, 28 Apr 1995 10:06:19 GMT References: <1995Apr25.003919.1947@pacbell.net> <1995Apr27.044419.1093@panix.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr27.044419.1093@panix.com>, asato@panix.com (Anton Sato) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Astrid Petrov -- Technische Universität München "A soul is not exclusive to biology." From apetrov@inria.fr Sat Apr 29 17:48:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!apetrov From: apetrov@inria.fr (Anton Petrov) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr29.174819.2698@inria.fr> Date: Sat, 29 Apr 1995 17:48:19 GMT References: <1995Apr25.003919.1947@pacbell.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr25.003919.1947@pacbell.net>, tbrennan@pacbell.net (Tyler Brennan) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > 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. -- Anton Petrov Tape trading list upon request. SASE required for international mail.