From hgonzalez@mindspring.com Thu Mar 02 10:04:38 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!hgonzalez From: hgonzalez@mindspring.com (Heather González) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar02.100438.2811@mindspring.com> Date: Thu, 02 Mar 1995 10:04:38 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 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'? -- Heather González *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From skuznetsov@uni-hamburg.de Thu Mar 02 22:37:38 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!skuznetsov From: skuznetsov@uni-hamburg.de (Steve Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar02.223738.4032@uni-hamburg.de> Date: Thu, 02 Mar 1995 22:37:38 GMT References: <1995Mar02.100438.2811@mindspring.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar02.100438.2811@mindspring.com>, hgonzalez@mindspring.com (Heather González) 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. -- Steve Kuznetsov Tape trading list upon request. SASE required for international mail. From msmirnov@cmu.edu Sun Mar 05 00:14:38 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!msmirnov From: msmirnov@cmu.edu (Mateo Smirnov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar05.001438.2272@cmu.edu> Date: Sun, 05 Mar 1995 00:14:38 GMT References: <1995Mar02.100438.2811@mindspring.com> <1995Mar02.223738.4032@uni-hamburg.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar02.223738.4032@uni-hamburg.de>, skuznetsov@uni-hamburg.de (Steve Kuznetsov) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Mateo Smirnov Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From svasiliev@panix.com Sun Mar 05 15:21:38 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!svasiliev From: svasiliev@panix.com (Steve Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar05.152138.1931@panix.com> Date: Sun, 05 Mar 1995 15:21:38 GMT References: <1995Mar02.100438.2811@mindspring.com> <1995Mar02.223738.4032@uni-hamburg.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar02.223738.4032@uni-hamburg.de>, skuznetsov@uni-hamburg.de (Steve Kuznetsov) 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. -- Steve Vasiliev "In theory there is no difference between theory and practice." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4