From cpopov@kth.se Thu Oct 20 16:09:26 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!cpopov From: cpopov@kth.se (Callum Popov) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct20.160926.8119@kth.se> Date: Thu, 20 Oct 1994 16:09:26 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se 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. -- Callum Popov "When every node is whole, the channel opens." Macintosh IIfx / Linux 1.2.13 From yandersson@illinois.edu Fri Oct 21 23:02:26 1994 Path: ashpoly!cascade!brgate!saturno!illinois!yandersson From: yandersson@illinois.edu (Yuki Andersson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct21.230226.2014@illinois.edu> Date: Fri, 21 Oct 1994 23:02:26 GMT References: <1994Oct20.160926.8119@kth.se> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Oct20.160926.8119@kth.se>, cpopov@kth.se (Callum 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Yuki Andersson Tape trading list upon request. SASE required for international mail. From ssuzuki@hanse.de Sat Oct 22 09:12:26 1994 Path: ashpoly!cascade!bigsur!hanse!ssuzuki From: ssuzuki@hanse.de (Seo-yeon Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct22.091226.3109@hanse.de> Date: Sat, 22 Oct 1994 09:12:26 GMT References: <1994Oct20.160926.8119@kth.se> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Oct20.160926.8119@kth.se>, cpopov@kth.se (Callum Popov) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Seo-yeon Suzuki Tape trading list upon request. SASE required for international mail.