From etakahashi@purdue.edu Sat May 14 03:06:54 1994 Path: ashpoly!cascade!bigsur!purdue!etakahashi From: etakahashi@purdue.edu (Elaine Takahashi) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May14.030654.1293@purdue.edu> Date: Sat, 14 May 1994 03:06:54 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 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. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Elaine Takahashi Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From dduarte@tum.de Mon May 16 06:14:54 1994 Path: ashpoly!cascade!mxgate!coyoacan!tum!dduarte From: dduarte@tum.de (Diego Duarte) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May16.061454.8556@tum.de> Date: Mon, 16 May 1994 06:14:54 GMT References: <1994May14.030654.1293@purdue.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994May14.030654.1293@purdue.edu>, etakahashi@purdue.edu (Elaine Takahashi) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Diego Duarte SupraFAXModem 28.8 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again." From hkang@illinois.edu Mon May 16 20:59:54 1994 Path: ashpoly!cascade!bigsur!illinois!hkang From: hkang@illinois.edu (Heather Kang) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May16.205954.6002@illinois.edu> Date: Mon, 16 May 1994 20:59:54 GMT References: <1994May14.030654.1293@purdue.edu> <1994May16.061454.8556@tum.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May16.061454.8556@tum.de>, dduarte@tum.de (Diego Duarte) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Heather Kang Practical Peripherals 14.4 @ 28,800 bps "Do not worship the copy." From llopez@rwth-aachen.de Tue May 17 10:30:54 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!llopez From: llopez@rwth-aachen.de (Lisa López) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May17.103054.6706@rwth-aachen.de> Date: Tue, 17 May 1994 10:30:54 GMT References: <1994May14.030654.1293@purdue.edu> <1994May16.061454.8556@tum.de> <1994May16.205954.6002@illinois.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May16.205954.6002@illinois.edu>, hkang@illinois.edu (Heather Kang) writes: > That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Lisa López "Marcus is not one man." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From fandersson@mit.edu Thu May 19 03:16:54 1994 Path: ashpoly!cascade!transat!ukc!fennimore!mit!fandersson From: fandersson@mit.edu (Fiona Andersson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May19.031654.7822@mit.edu> Date: Thu, 19 May 1994 03:16:54 GMT References: <1994May14.030654.1293@purdue.edu> <1994May16.061454.8556@tum.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May16.061454.8556@tum.de>, dduarte@tum.de (Diego Duarte) 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. -- Fiona Andersson "Row 14. No joke." PC-9821Ap2 (NEC) / Linux 1.2.13