From tramirez@kth.se Tue Oct 01 02:02:16 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!tramirez From: tramirez@kth.se (Tomas Ramírez) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Oct01.020216.2472@kth.se> Date: Tue, 01 Oct 1996 02:02:16 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 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. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Tomas Ramírez -- Royal Institute of Technology, Stockholm "5 sigma is a discovery. 7 is a question." From spopov@mit.edu Tue Oct 01 15:46:16 1996 Path: ashpoly!cascade!bigsur!mit!spopov From: spopov@mit.edu (Sergei Popov) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Oct01.154616.6589@mit.edu> Date: Tue, 01 Oct 1996 15:46:16 GMT References: <1996Oct01.020216.2472@kth.se> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Oct01.020216.2472@kth.se>, tramirez@kth.se (Tomas Ramírez) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Sergei Popov -- Massachusetts Institute of Technology "A soul is not exclusive to biology." From mkarlsson@pacbell.net Thu Oct 03 11:51:16 1996 Path: ashpoly!cascade!bigsur!pacbell!mkarlsson From: mkarlsson@pacbell.net (Marisol Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Oct03.115116.9099@pacbell.net> Date: Thu, 03 Oct 1996 11:51:16 GMT References: <1996Oct01.020216.2472@kth.se> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Oct01.020216.2472@kth.se>, tramirez@kth.se (Tomas Ramírez) writes: > 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Marisol Karlsson Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From jmuller@kth.se Sat Oct 05 07:03:16 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!jmuller From: jmuller@kth.se (Jens Müller) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Oct05.070316.4927@kth.se> Date: Sat, 05 Oct 1996 07:03:16 GMT References: <1996Oct01.020216.2472@kth.se> <1996Oct01.154616.6589@mit.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct01.154616.6589@mit.edu>, spopov@mit.edu (Sergei 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. -- Jens Müller "We don't sign stars. We build them." Sun SparcStation 20 / TOS 4.04 From djohansson@mit.edu Sun Oct 06 14:21:16 1996 Path: ashpoly!cascade!bigsur!mit!djohansson From: djohansson@mit.edu (Dave Johansson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Oct06.142116.9071@mit.edu> Date: Sun, 06 Oct 1996 14:21:16 GMT References: <1996Oct01.020216.2472@kth.se> <1996Oct01.154616.6589@mit.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Oct01.154616.6589@mit.edu>, spopov@mit.edu (Sergei 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. -- Dave Johansson Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------