From gduarte@netcom.com Tue Nov 07 16:14:26 1995 Path: ashpoly!cascade!bigsur!netcom!gduarte From: gduarte@netcom.com (Göran Duarte) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov07.161426.6228@netcom.com> Date: Tue, 07 Nov 1995 16:14:26 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Göran Duarte Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From mgirard@clari.net Thu Nov 09 15:05:26 1995 Path: ashpoly!cascade!brgate!saturno!clari!mgirard From: mgirard@clari.net (Matthias Girard) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov09.150526.2295@clari.net> Date: Thu, 09 Nov 1995 15:05:26 GMT References: <1995Nov07.161426.6228@netcom.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Nov07.161426.6228@netcom.com>, gduarte@netcom.com (Göran Duarte) 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. -- Matthias Girard Tape trading list upon request. SASE required for international mail. From sramirez@pacbell.net Fri Nov 10 06:23:26 1995 Path: ashpoly!cascade!bigsur!pacbell!sramirez From: sramirez@pacbell.net (Sven Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov10.062326.9506@pacbell.net> Date: Fri, 10 Nov 1995 06:23:26 GMT References: <1995Nov07.161426.6228@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Nov07.161426.6228@netcom.com>, gduarte@netcom.com (Göran Duarte) 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. -- Sven Ramírez -- Pacific Bell Internet Services "5 sigma is a discovery. 7 is a question." From nkowalski@ox.ac.uk Sat Nov 11 15:33:26 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!nkowalski From: nkowalski@ox.ac.uk (Nadia Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov11.153326.7830@ox.ac.uk> Date: Sat, 11 Nov 1995 15:33:26 GMT References: <1995Nov07.161426.6228@netcom.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov07.161426.6228@netcom.com>, gduarte@netcom.com (Göran Duarte) 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 Kowalski Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From ssilva@uu.net Sun Nov 12 14:14:26 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!ssilva From: ssilva@uu.net (Sergei Silva) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov12.141426.6983@uu.net> Date: Sun, 12 Nov 1995 14:14:26 GMT References: <1995Nov07.161426.6228@netcom.com> <1995Nov09.150526.2295@clari.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov09.150526.2295@clari.net>, mgirard@clari.net (Matthias Girard) 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! If you are posting from AOL, please read RFC 1036 before posting again. -- Sergei Silva "Row 14. No joke." Macintosh IIfx / SunOS 4.1.4