From dwatanabe@cmu.edu Sun Aug 28 22:09:18 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!dwatanabe From: dwatanabe@cmu.edu (Diego Watanabe) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug28.220918.2705@cmu.edu> Date: Sun, 28 Aug 1994 22:09:18 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Did Marcus take the decryption EPROM with him when he left the lab? -- Diego Watanabe | dwatanabe@cmu.edu PGP Key fingerprint: 8653 4D00 3E88 3813 "Keep the channels open." From klaurent@utexas.edu Tue Aug 30 11:09:18 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!klaurent From: klaurent@utexas.edu (Karen Laurent) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug30.110918.6273@utexas.edu> Date: Tue, 30 Aug 1994 11:09:18 GMT References: <1994Aug28.220918.2705@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Aug28.220918.2705@cmu.edu>, dwatanabe@cmu.edu (Diego Watanabe) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Top-posters will be placed in my ~/.killfile without notice. -- Karen Laurent SupraFAXModem 28.8 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question." From lnakamura@rwth-aachen.de Wed Aug 31 14:50:18 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!lnakamura From: lnakamura@rwth-aachen.de (Lisa Nakamura) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug31.145018.6823@rwth-aachen.de> Date: Wed, 31 Aug 1994 14:50:18 GMT References: <1994Aug28.220918.2705@cmu.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug28.220918.2705@cmu.edu>, dwatanabe@cmu.edu (Diego Watanabe) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Lisa Nakamura "There are 14 nodes and only 10 countries. Count again." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3