From jgirard@purdue.edu Sun Oct 15 04:43:59 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!jgirard From: jgirard@purdue.edu (Joachim Girard) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct15.044359.1757@purdue.edu> Date: Sun, 15 Oct 1995 04:43:59 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu 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. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. 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? -- Joachim Girard Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From hmacdonald@mit.edu Mon Oct 16 10:33:59 1995 Path: ashpoly!cascade!bigsur!mit!hmacdonald From: hmacdonald@mit.edu (Hana MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct16.103359.2103@mit.edu> Date: Mon, 16 Oct 1995 10:33:59 GMT References: <1995Oct15.044359.1757@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Oct15.044359.1757@purdue.edu>, jgirard@purdue.edu (Joachim Girard) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Hana MacDonald -- Massachusetts Institute of Technology "Hold for relay." From sivanov@cmu.edu Wed Oct 18 11:30:59 1995 Path: ashpoly!cascade!brgate!saturno!cmu!sivanov From: sivanov@cmu.edu (Sun-mi Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct18.113059.3450@cmu.edu> Date: Wed, 18 Oct 1995 11:30:59 GMT References: <1995Oct15.044359.1757@purdue.edu> <1995Oct16.103359.2103@mit.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Oct16.103359.2103@mit.edu>, hmacdonald@mit.edu (Hana MacDonald) 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! Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Sun-mi Ivanov US Robotics Courier V.34 @ 28,800 bps "A soul is not exclusive to biology." From vkim@tum.de Wed Oct 18 21:56:59 1995 Path: ashpoly!cascade!brgate!saturno!tum!vkim From: vkim@tum.de (Valeria Kim) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct18.215659.6149@tum.de> Date: Wed, 18 Oct 1995 21:56:59 GMT References: <1995Oct15.044359.1757@purdue.edu> <1995Oct16.103359.2103@mit.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct16.103359.2103@mit.edu>, hmacdonald@mit.edu (Hana MacDonald) 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 Kim Opinions expressed are solely my own and not those of Technische Universität München. ------------------------------------------------------------