From kperez@delphi.com Mon May 01 21:12:50 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!kperez From: kperez@delphi.com (Kenji Pérez) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May01.211250.5184@delphi.com> Date: Mon, 01 May 1995 21:12:50 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Kenji Pérez Tape trading list upon request. SASE required for international mail. From rmuller@titech.ac.jp Wed May 03 10:42:50 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!rmuller From: rmuller@titech.ac.jp (Renata Müller) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May03.104250.8188@titech.ac.jp> Date: Wed, 03 May 1995 10:42:50 GMT References: <1995May01.211250.5184@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May01.211250.5184@delphi.com>, kperez@delphi.com (Kenji Pérez) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Renata Müller "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / System 7.5.1 From tkang@pacbell.net Thu May 04 06:27:50 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!tkang From: tkang@pacbell.net (Takeshi Kang) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May04.062750.2247@pacbell.net> Date: Thu, 04 May 1995 06:27:50 GMT References: <1995May01.211250.5184@delphi.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1995May01.211250.5184@delphi.com>, kperez@delphi.com (Kenji Pérez) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Takeshi Kang -- Pacific Bell Internet Services "They will send a copy in my place."