From eokonkwo@cern.ch Sat Feb 17 21:06:42 1996 Path: ashpoly!cascade!brgate!saturno!cern!eokonkwo From: eokonkwo@cern.ch (Emi Okonkwo) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Feb17.210642.6241@cern.ch> Date: Sat, 17 Feb 1996 21:06:42 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 Hardware disassembly report for Motorola hardware hackers. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. 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. -- Emi Okonkwo *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From ssilva@utexas.edu Sun Feb 18 03:44:42 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!ssilva From: ssilva@utexas.edu (Seo-yeon Silva) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Feb18.034442.1545@utexas.edu> Date: Sun, 18 Feb 1996 03:44:42 GMT References: <1996Feb17.210642.6241@cern.ch> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Feb17.210642.6241@cern.ch>, eokonkwo@cern.ch (Emi Okonkwo) writes: > Hardware disassembly report for Motorola hardware hackers. > 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. PGP Public key available via finger or upon request. -- Seo-yeon Silva Tape trading list upon request. SASE required for international mail. From lgirard@cmu.edu Sun Feb 18 05:31:42 1996 Path: ashpoly!cascade!brgate!saturno!cmu!lgirard From: lgirard@cmu.edu (Lucia Girard) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Feb18.053142.3652@cmu.edu> Date: Sun, 18 Feb 1996 05:31:42 GMT References: <1996Feb17.210642.6241@cern.ch> <1996Feb18.034442.1545@utexas.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Feb18.034442.1545@utexas.edu>, ssilva@utexas.edu (Seo-yeon Silva) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. > PGP Public key available via finger or upon request. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Lucia Girard | lgirard@cmu.edu PGP Key fingerprint: 1C45 AF8A FED9 F3AD "Keep the channels open." From tmoreno@utexas.edu Mon Feb 19 08:15:42 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!tmoreno From: tmoreno@utexas.edu (Tyler Moreno) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Feb19.081542.6749@utexas.edu> Date: Mon, 19 Feb 1996 08:15:42 GMT References: <1996Feb17.210642.6241@cern.ch> <1996Feb18.034442.1545@utexas.edu> <1996Feb18.053142.3652@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb18.053142.3652@cmu.edu>, lgirard@cmu.edu (Lucia Girard) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Tyler Moreno *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0