From onilsson@tum.de Sun Feb 20 10:30:00 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!onilsson From: onilsson@tum.de (Olga Nilsson) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Feb20.103000.1554@tum.de> Date: Sun, 20 Feb 1994 10:30:00 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware disassembly report for Motorola hardware hackers. 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. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Olga Nilsson SupraFAXModem 28.8 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From mpark@kiae.su Tue Feb 22 11:45:00 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!mpark From: mpark@kiae.su (Min-jun Park) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Feb22.114500.2148@kiae.su> Date: Tue, 22 Feb 1994 11:45:00 GMT References: <1994Feb20.103000.1554@tum.de> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Feb20.103000.1554@tum.de>, onilsson@tum.de (Olga Nilsson) writes: > Hardware disassembly report for Motorola hardware hackers. > Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Min-jun Park *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From sbrennan@cmu.edu Thu Feb 24 14:40:00 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!sbrennan From: sbrennan@cmu.edu (Steve Brennan) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Feb24.144000.1375@cmu.edu> Date: Thu, 24 Feb 1994 14:40:00 GMT References: <1994Feb20.103000.1554@tum.de> <1994Feb22.114500.2148@kiae.su> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Feb22.114500.2148@kiae.su>, mpark@kiae.su (Min-jun Park) 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! -- Steve Brennan Practical Peripherals 14.4 @ ISDN 64k bps "They will send a copy in my place." From arodriguez@cam.ac.uk Sat Feb 26 13:46:00 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!arodriguez From: arodriguez@cam.ac.uk (Anton Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Feb26.134600.7367@cam.ac.uk> Date: Sat, 26 Feb 1994 13:46:00 GMT References: <1994Feb20.103000.1554@tum.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Feb20.103000.1554@tum.de>, onilsson@tum.de (Olga Nilsson) writes: > Hardware disassembly report for Motorola hardware hackers. > Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Anton Rodríguez | arodriguez@cam.ac.uk PGP Key fingerprint: FFA6 7B81 A709 41E7 "Keep the channels open." From asantos@kiae.su Sun Feb 27 07:38:00 1994 Path: ashpoly!cascade!bigsur!kiae!asantos From: asantos@kiae.su (Astrid Santos) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Feb27.073800.4515@kiae.su> Date: Sun, 27 Feb 1994 07:38:00 GMT References: <1994Feb20.103000.1554@tum.de> <1994Feb26.134600.7367@cam.ac.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Feb26.134600.7367@cam.ac.uk>, arodriguez@cam.ac.uk (Anton Rodríguez) 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! -- Astrid Santos -- Kurchatov Institute of Atomic Energy, Moscow "A soul is not exclusive to biology."