From ckuznetsov@delphi.com Wed Apr 13 05:02:09 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!ckuznetsov From: ckuznetsov@delphi.com (Callum Kuznetsov) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr13.050209.8180@delphi.com> Date: Wed, 13 Apr 1994 05:02:09 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Callum Kuznetsov Practical Peripherals 14.4 @ 28,800 bps "Hold for relay." From tjohansson@mindspring.com Thu Apr 14 21:42:09 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!tjohansson From: tjohansson@mindspring.com (Thiago Johansson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr14.214209.6886@mindspring.com> Date: Thu, 14 Apr 1994 21:42:09 GMT References: <1994Apr13.050209.8180@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Apr13.050209.8180@delphi.com>, ckuznetsov@delphi.com (Callum Kuznetsov) 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. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- === Thiago Johansson === Dept of Electrical Engineering, MindSpring Enterprises "5 sigma is a discovery. 7 is a question." From mmoreno@kth.se Fri Apr 15 22:34:09 1994 Path: ashpoly!cascade!brgate!saturno!kth!mmoreno From: mmoreno@kth.se (Mei Moreno) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr15.223409.6427@kth.se> Date: Fri, 15 Apr 1994 22:34:09 GMT References: <1994Apr13.050209.8180@delphi.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Apr13.050209.8180@delphi.com>, ckuznetsov@delphi.com (Callum Kuznetsov) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mei Moreno *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0