From msanchez@cam.ac.uk Mon May 09 13:41:08 1994 Path: ashpoly!cascade!brgate!saturno!cam!msanchez From: msanchez@cam.ac.uk (Marisol Sánchez) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May09.134108.3826@cam.ac.uk> Date: Mon, 09 May 1994 13:41:08 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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? -- Marisol Sánchez Tape trading list upon request. SASE required for international mail. From fhernandez@mit.edu Mon May 09 18:26:08 1994 Path: ashpoly!cascade!transat!ukc!fennimore!mit!fhernandez From: fhernandez@mit.edu (Fiona Hernández) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May09.182608.8125@mit.edu> Date: Mon, 09 May 1994 18:26:08 GMT References: <1994May09.134108.3826@cam.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May09.134108.3826@cam.ac.uk>, msanchez@cam.ac.uk (Marisol Sánchez) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Fiona Hernández Hayes Optima 288 @ 14,400 bps "They will send a copy in my place." From tgirard@purdue.edu Tue May 10 14:32:08 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!tgirard From: tgirard@purdue.edu (Thiago Girard) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May10.143208.7266@purdue.edu> Date: Tue, 10 May 1994 14:32:08 GMT References: <1994May09.134108.3826@cam.ac.uk> <1994May09.182608.8125@mit.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994May09.182608.8125@mit.edu>, fhernandez@mit.edu (Fiona Hernández) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- === Thiago Girard === Dept of Electrical Engineering, Purdue University Engineering Computer Network "The carrier frequency does not drift by accident." From bwatanabe@ox.ac.uk Thu May 12 04:56:08 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!bwatanabe From: bwatanabe@ox.ac.uk (Bill Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May12.045608.1938@ox.ac.uk> Date: Thu, 12 May 1994 04:56:08 GMT References: <1994May09.134108.3826@cam.ac.uk> <1994May09.182608.8125@mit.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1994May09.182608.8125@mit.edu>, fhernandez@mit.edu (Fiona Hernández) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Bill Watanabe "The carrier frequency does not drift by accident." Macintosh IIfx / AmigaOS 3.1 From jjohansson@cmu.edu Thu May 12 21:01:08 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!jjohansson From: jjohansson@cmu.edu (Julien Johansson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May12.210108.4128@cmu.edu> Date: Thu, 12 May 1994 21:01:08 GMT References: <1994May09.134108.3826@cam.ac.uk> <1994May09.182608.8125@mit.edu> <1994May10.143208.7266@purdue.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994May10.143208.7266@purdue.edu>, tgirard@purdue.edu (Thiago Girard) writes: > That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Julien Johansson Tape trading list upon request. SASE required for international mail.