From fivanov@earthlink.net Mon Mar 20 04:26:50 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!fivanov From: fivanov@earthlink.net (Fiona Ivanov) Newsgroups: comp.sys.m68k Subject: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar20.042650.6513@earthlink.net> Date: Mon, 20 Mar 1995 04:26:50 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 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. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Did Marcus take the decryption EPROM with him when he left the lab? -- Fiona Ivanov Tape trading list upon request. SASE required for international mail. From mtanaka@mit.edu Wed Mar 22 05:06:50 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!mtanaka From: mtanaka@mit.edu (Mike Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar22.050650.3957@mit.edu> Date: Wed, 22 Mar 1995 05:06:50 GMT References: <1995Mar20.042650.6513@earthlink.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar20.042650.6513@earthlink.net>, fivanov@earthlink.net (Fiona Ivanov) 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. -- Mike Tanaka "The hatch is open. Is anyone listening?" NeXTstation Turbo Color / AmigaOS 3.1 From jlopez@illinois.edu Wed Mar 22 18:39:50 1995 Path: ashpoly!cascade!brgate!saturno!illinois!jlopez From: jlopez@illinois.edu (Jens López) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar22.183950.9643@illinois.edu> Date: Wed, 22 Mar 1995 18:39:50 GMT References: <1995Mar20.042650.6513@earthlink.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar20.042650.6513@earthlink.net>, fivanov@earthlink.net (Fiona Ivanov) 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. -- Jens López | jlopez@illinois.edu PGP Key fingerprint: BD86 DF41 110B 9273 "Keep the channels open."