From skuznetsov@clari.net Thu Dec 15 07:41:31 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!skuznetsov From: skuznetsov@clari.net (Sven Kuznetsov) Newsgroups: comp.sys.m68k Subject: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Dec15.074131.8386@clari.net> Date: Thu, 15 Dec 1994 07:41:31 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Hardware disassembly report for Motorola hardware hackers. 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. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Sven Kuznetsov Tape trading list upon request. SASE required for international mail. From achoi@cmu.edu Thu Dec 15 20:33:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!cmu!achoi From: achoi@cmu.edu (Anja Choi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Dec15.203331.8411@cmu.edu> Date: Thu, 15 Dec 1994 20:33:31 GMT References: <1994Dec15.074131.8386@clari.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Dec15.074131.8386@clari.net>, skuznetsov@clari.net (Sven Kuznetsov) writes: > Hardware disassembly report for Motorola hardware hackers. > 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. -- Anja Choi Practical Peripherals 14.4 @ 28,800 bps "Row 14. No joke." From aramirez@cam.ac.uk Fri Dec 16 18:24:31 1994 Path: ashpoly!cascade!brgate!saturno!cam!aramirez From: aramirez@cam.ac.uk (Astrid Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Dec16.182431.5728@cam.ac.uk> Date: Fri, 16 Dec 1994 18:24:31 GMT References: <1994Dec15.074131.8386@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec15.074131.8386@clari.net>, skuznetsov@clari.net (Sven Kuznetsov) writes: > Hardware disassembly report for Motorola hardware hackers. > 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. -- Astrid Ramírez Tape trading list upon request. SASE required for international mail. From kschneider@kth.se Sun Dec 18 12:20:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!kth!kschneider From: kschneider@kth.se (Katrin Schneider) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Dec18.122031.3593@kth.se> Date: Sun, 18 Dec 1994 12:20:31 GMT References: <1994Dec15.074131.8386@clari.net> <1994Dec16.182431.5728@cam.ac.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec16.182431.5728@cam.ac.uk>, aramirez@cam.ac.uk (Astrid Ramírez) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Katrin Schneider Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------ From khernandez@mit.edu Sun Dec 18 15:31:31 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!khernandez From: khernandez@mit.edu (Karen Hernández) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Dec18.153131.4397@mit.edu> Date: Sun, 18 Dec 1994 15:31:31 GMT References: <1994Dec15.074131.8386@clari.net> <1994Dec15.203331.8411@cmu.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Dec15.203331.8411@cmu.edu>, achoi@cmu.edu (Anja Choi) 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! -- Karen Hernández -- Massachusetts Institute of Technology "Tape doesn't lie at 02:14. Ears do."