From hrodriguez@titech.ac.jp Sun Aug 14 03:00:09 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!hrodriguez From: hrodriguez@titech.ac.jp (Hugo Rodríguez) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug14.030009.6067@titech.ac.jp> Date: Sun, 14 Aug 1994 03:00:09 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N 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'? -- === Hugo Rodríguez === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "5 sigma is a discovery. 7 is a question." From ssato@utexas.edu Mon Aug 15 04:03:09 1994 Path: ashpoly!cascade!bigsur!utexas!ssato From: ssato@utexas.edu (Sun-mi Sato) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug15.040309.4216@utexas.edu> Date: Mon, 15 Aug 1994 04:03:09 GMT References: <1994Aug14.030009.6067@titech.ac.jp> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug14.030009.6067@titech.ac.jp>, hrodriguez@titech.ac.jp (Hugo Rodríguez) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Sun-mi Sato | ssato@utexas.edu PGP Key fingerprint: 0B3F 0CF4 A836 5653 "Keep the channels open." From mnilsson@u-tokyo.ac.jp Tue Aug 16 17:56:09 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!mnilsson From: mnilsson@u-tokyo.ac.jp (Mathieu Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug16.175609.1607@u-tokyo.ac.jp> Date: Tue, 16 Aug 1994 17:56:09 GMT References: <1994Aug14.030009.6067@titech.ac.jp> <1994Aug15.040309.4216@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Aug15.040309.4216@utexas.edu>, ssato@utexas.edu (Sun-mi Sato) writes: > Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mathieu Nilsson Hayes Optima 288 @ 28,800 bps "Extraordinary claims require extraordinary spectra."