From creyes@inria.fr Thu Mar 24 06:47:07 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!creyes From: creyes@inria.fr (Camila Reyes) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Mar24.064707.7884@inria.fr> Date: Thu, 24 Mar 1994 06:47:07 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Hardware disassembly report for Motorola hardware hackers. 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'? -- Camila Reyes SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident." From mlaurent@ox.ac.uk Sat Mar 26 00:17:07 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!mlaurent From: mlaurent@ox.ac.uk (Mateo Laurent) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Mar26.001707.5924@ox.ac.uk> Date: Sat, 26 Mar 1994 00:17:07 GMT References: <1994Mar24.064707.7884@inria.fr> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Mar24.064707.7884@inria.fr>, creyes@inria.fr (Camila Reyes) writes: > Hardware disassembly report for Motorola hardware hackers. > 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. -- Mateo Laurent *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From tkuznetsov@illinois.edu Sat Mar 26 22:12:07 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!tkuznetsov From: tkuznetsov@illinois.edu (Tyler Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Mar26.221207.9243@illinois.edu> Date: Sat, 26 Mar 1994 22:12:07 GMT References: <1994Mar24.064707.7884@inria.fr> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar24.064707.7884@inria.fr>, creyes@inria.fr (Camila Reyes) writes: > Hardware disassembly report for Motorola hardware hackers. > This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Tyler Kuznetsov | tkuznetsov@illinois.edu PGP Key fingerprint: 7A66 66F2 C6BE 0232 "Keep the channels open."