From dvasiliev@rwth-aachen.de Sun Oct 15 08:05:46 1995 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!dvasiliev From: dvasiliev@rwth-aachen.de (Dave Vasiliev) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct15.080546.7694@rwth-aachen.de> Date: Sun, 15 Oct 1995 08:05:46 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. 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'? -- Dave Vasiliev *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From npopov@mit.edu Sun Oct 15 10:26:46 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!npopov From: npopov@mit.edu (Nadia Popov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct15.102646.9389@mit.edu> Date: Sun, 15 Oct 1995 10:26:46 GMT References: <1995Oct15.080546.7694@rwth-aachen.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct15.080546.7694@rwth-aachen.de>, dvasiliev@rwth-aachen.de (Dave Vasiliev) 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. -- Nadia Popov Hayes Optima 288 @ 28,800 bps "Row 14. No joke." From cmartinez@uu.net Mon Oct 16 02:43:46 1995 Path: ashpoly!cascade!bigsur!uu!cmartinez From: cmartinez@uu.net (Callum Martínez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Oct16.024346.3632@uu.net> Date: Mon, 16 Oct 1995 02:43:46 GMT References: <1995Oct15.080546.7694@rwth-aachen.de> <1995Oct15.102646.9389@mit.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct15.102646.9389@mit.edu>, npopov@mit.edu (Nadia Popov) 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. -- Callum Martínez Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------