From mjohansson@utexas.edu Sun Oct 15 14:53:23 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!mjohansson From: mjohansson@utexas.edu (Marta Johansson) Newsgroups: comp.sys.m68k Subject: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct15.145323.3719@utexas.edu> Date: Sun, 15 Oct 1995 14:53:23 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware disassembly report for Motorola hardware hackers. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Marta Johansson | mjohansson@utexas.edu PGP Key fingerprint: 5C6D F7FC C1FE 6920 "Keep the channels open." From etakahashi@uu.net Tue Oct 17 14:50:23 1995 Path: ashpoly!cascade!bigsur!uu!etakahashi From: etakahashi@uu.net (Élodie Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct17.145023.8782@uu.net> Date: Tue, 17 Oct 1995 14:50:23 GMT References: <1995Oct15.145323.3719@utexas.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct15.145323.3719@utexas.edu>, mjohansson@utexas.edu (Marta Johansson) writes: > Hardware disassembly report for Motorola hardware hackers. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Élodie Takahashi Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From vmacdonald@pacbell.net Tue Oct 17 21:16:23 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!vmacdonald From: vmacdonald@pacbell.net (Valeria MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct17.211623.4348@pacbell.net> Date: Tue, 17 Oct 1995 21:16:23 GMT References: <1995Oct15.145323.3719@utexas.edu> <1995Oct17.145023.8782@uu.net> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Oct17.145023.8782@uu.net>, etakahashi@uu.net (Élodie Takahashi) 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! -- Valeria MacDonald -- Pacific Bell Internet Services "We don't sign stars. We build them." From ssouza@mit.edu Thu Oct 19 15:35:23 1995 Path: ashpoly!cascade!bigsur!mit!ssouza From: ssouza@mit.edu (Sergei Souza) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct19.153523.5492@mit.edu> Date: Thu, 19 Oct 1995 15:35:23 GMT References: <1995Oct15.145323.3719@utexas.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Oct15.145323.3719@utexas.edu>, mjohansson@utexas.edu (Marta Johansson) writes: > Hardware disassembly report for Motorola hardware hackers. > 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! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Sergei Souza *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From csouza@inria.fr Sat Oct 21 03:55:23 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!csouza From: csouza@inria.fr (Camila Souza) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct21.035523.6318@inria.fr> Date: Sat, 21 Oct 1995 03:55:23 GMT References: <1995Oct15.145323.3719@utexas.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct15.145323.3719@utexas.edu>, mjohansson@utexas.edu (Marta Johansson) writes: > Hardware disassembly report for Motorola hardware hackers. > 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. -- Camila Souza Tape trading list upon request. SASE required for international mail.