From hcampbell@panix.com Fri May 20 16:43:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!hcampbell From: hcampbell@panix.com (Heather Campbell) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May20.164331.4391@panix.com> Date: Fri, 20 May 1994 16:43:31 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Did Marcus take the decryption EPROM with him when he left the lab? -- Heather Campbell Tape trading list upon request. SASE required for international mail. From abrennan@cmu.edu Sun May 22 04:38:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!abrennan From: abrennan@cmu.edu (Amy Brennan) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May22.043831.3931@cmu.edu> Date: Sun, 22 May 1994 04:38:31 GMT References: <1994May20.164331.4391@panix.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May20.164331.4391@panix.com>, hcampbell@panix.com (Heather Campbell) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > 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. -- Amy Brennan Tape trading list upon request. SASE required for international mail. From okowalski@titech.ac.jp Mon May 23 23:38:31 1994 Path: ashpoly!cascade!bigsur!titech!okowalski From: okowalski@titech.ac.jp (Olga Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May23.233831.4728@titech.ac.jp> Date: Mon, 23 May 1994 23:38:31 GMT References: <1994May20.164331.4391@panix.com> <1994May22.043831.3931@cmu.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994May22.043831.3931@cmu.edu>, abrennan@cmu.edu (Amy Brennan) 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! PGP Public key available via finger or upon request. -- Olga Kowalski Tape trading list upon request. SASE required for international mail. From tkuznetsov@utexas.edu Tue May 24 12:23:31 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!tkuznetsov From: tkuznetsov@utexas.edu (Tomas Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May24.122331.9679@utexas.edu> Date: Tue, 24 May 1994 12:23:31 GMT References: <1994May20.164331.4391@panix.com> <1994May22.043831.3931@cmu.edu> <1994May23.233831.4728@titech.ac.jp> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994May23.233831.4728@titech.ac.jp>, okowalski@titech.ac.jp (Olga Kowalski) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! > PGP Public key available via finger or upon request. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. PGP Public key available via finger or upon request. -- Tomas Kuznetsov Tape trading list upon request. SASE required for international mail. From jmacdonald@uu.net Thu May 26 04:38:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!jmacdonald From: jmacdonald@uu.net (Joachim MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May26.043831.8824@uu.net> Date: Thu, 26 May 1994 04:38:31 GMT References: <1994May20.164331.4391@panix.com> <1994May22.043831.3931@cmu.edu> <1994May23.233831.4728@titech.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994May23.233831.4728@titech.ac.jp>, okowalski@titech.ac.jp (Olga Kowalski) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Joachim MacDonald *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0