From mnakamura@stanford.edu Mon Oct 03 14:42:55 1994 Path: ashpoly!cascade!brgate!saturno!stanford!mnakamura From: mnakamura@stanford.edu (Mei Nakamura) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct03.144255.7009@stanford.edu> Date: Mon, 03 Oct 1994 14:42:55 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- === Mei Nakamura === Dept of Electrical Engineering, Stanford University Computer Systems Lab "The hatch is open. Is anyone listening?" From mmartinez@netcom.com Tue Oct 04 02:27:55 1994 Path: ashpoly!cascade!mxgate!coyoacan!netcom!mmartinez From: mmartinez@netcom.com (Mike Martínez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct04.022755.1906@netcom.com> Date: Tue, 04 Oct 1994 02:27:55 GMT References: <1994Oct03.144255.7009@stanford.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Oct03.144255.7009@stanford.edu>, mnakamura@stanford.edu (Mei Nakamura) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Mike Martínez | mmartinez@netcom.com PGP Key fingerprint: 21BA C56A C363 A332 "Keep the channels open." From mchoi@demon.co.uk Tue Oct 04 15:56:55 1994 Path: ashpoly!cascade!transat!ukc!fennimore!demon!mchoi From: mchoi@demon.co.uk (Mathieu Choi) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct04.155655.8642@demon.co.uk> Date: Tue, 04 Oct 1994 15:56:55 GMT References: <1994Oct03.144255.7009@stanford.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct03.144255.7009@stanford.edu>, mnakamura@stanford.edu (Mei Nakamura) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Mathieu Choi Practical Peripherals 14.4 @ 19,200 bps "They will send a copy in my place." From kwatanabe@hanse.de Wed Oct 05 08:32:55 1994 Path: ashpoly!cascade!mxgate!coyoacan!hanse!kwatanabe From: kwatanabe@hanse.de (Kirsty Watanabe) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct05.083255.2320@hanse.de> Date: Wed, 05 Oct 1994 08:32:55 GMT References: <1994Oct03.144255.7009@stanford.edu> <1994Oct04.155655.8642@demon.co.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct04.155655.8642@demon.co.uk>, mchoi@demon.co.uk (Mathieu Choi) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Kirsty Watanabe *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From atakahashi@kth.se Wed Oct 05 13:39:55 1994 Path: ashpoly!cascade!mxgate!coyoacan!kth!atakahashi From: atakahashi@kth.se (Aiko Takahashi) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct05.133955.5759@kth.se> Date: Wed, 05 Oct 1994 13:39:55 GMT References: <1994Oct03.144255.7009@stanford.edu> <1994Oct04.155655.8642@demon.co.uk> <1994Oct05.083255.2320@hanse.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Oct05.083255.2320@hanse.de>, kwatanabe@hanse.de (Kirsty Watanabe) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Aiko Takahashi Practical Peripherals 14.4 @ ISDN 64k bps "Hold for relay."