From elindqvist@mit.edu Thu Sep 01 15:56:08 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!elindqvist From: elindqvist@mit.edu (Élodie Lindqvist) Newsgroups: comp.sys.m68k Subject: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Sep01.155608.9336@mit.edu> Date: Thu, 01 Sep 1994 15:56:08 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Élodie Lindqvist Tape trading list upon request. SASE required for international mail. From tsanchez@titech.ac.jp Thu Sep 01 22:13:08 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!tsanchez From: tsanchez@titech.ac.jp (Tobias Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Sep01.221308.6768@titech.ac.jp> Date: Thu, 01 Sep 1994 22:13:08 GMT References: <1994Sep01.155608.9336@mit.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Sep01.155608.9336@mit.edu>, elindqvist@mit.edu (Élodie Lindqvist) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. If you are posting from AOL, please read RFC 1036 before posting again. -- Tobias Sánchez Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------ From tramirez@kth.se Sat Sep 03 16:11:08 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!tramirez From: tramirez@kth.se (Tomas Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Sep03.161108.1203@kth.se> Date: Sat, 03 Sep 1994 16:11:08 GMT References: <1994Sep01.155608.9336@mit.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Sep01.155608.9336@mit.edu>, elindqvist@mit.edu (Élodie Lindqvist) 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. -- Tomas Ramírez *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From dsuzuki@kth.se Sun Sep 04 07:14:08 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!dsuzuki From: dsuzuki@kth.se (Diego Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Sep04.071408.9491@kth.se> Date: Sun, 04 Sep 1994 07:14:08 GMT References: <1994Sep01.155608.9336@mit.edu> <1994Sep03.161108.1203@kth.se> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Sep03.161108.1203@kth.se>, tramirez@kth.se (Tomas Ramírez) 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! -- Diego Suzuki Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------