From apopov@pipeline.com Tue May 09 21:23:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!apopov From: apopov@pipeline.com (Aiko Popov) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May09.212323.7625@pipeline.com> Date: Tue, 09 May 1995 21:23:23 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- === Aiko Popov === Dept of Electrical Engineering, The Pipeline Internet Network "The hatch is open. Is anyone listening?" From slindqvist@cam.ac.uk Wed May 10 06:20:23 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!slindqvist From: slindqvist@cam.ac.uk (Sun-mi Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May10.062023.6029@cam.ac.uk> Date: Wed, 10 May 1995 06:20:23 GMT References: <1995May09.212323.7625@pipeline.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May09.212323.7625@pipeline.com>, apopov@pipeline.com (Aiko Popov) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > 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. -- Sun-mi Lindqvist "A soul is not exclusive to biology." PC-9821Ap2 (NEC) / AmigaOS 3.1 From ioliveira@stanford.edu Wed May 10 13:53:23 1995 Path: ashpoly!cascade!bigsur!stanford!ioliveira From: ioliveira@stanford.edu (Ines Oliveira) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May10.135323.1254@stanford.edu> Date: Wed, 10 May 1995 13:53:23 GMT References: <1995May09.212323.7625@pipeline.com> <1995May10.062023.6029@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May10.062023.6029@cam.ac.uk>, slindqvist@cam.ac.uk (Sun-mi Lindqvist) 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! -- Ines Oliveira Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------