From akarlsson@mit.edu Sat Aug 26 22:52:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!akarlsson From: akarlsson@mit.edu (Anja Karlsson) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug26.225200.8003@mit.edu> Date: Sat, 26 Aug 1995 22:52:00 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Anja Karlsson "There are 14 nodes and only 10 countries. Count again." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From mivanov@kiae.su Mon Aug 28 03:14:00 1995 Path: ashpoly!cascade!brgate!saturno!kiae!mivanov From: mivanov@kiae.su (Mateo Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug28.031400.5589@kiae.su> Date: Mon, 28 Aug 1995 03:14:00 GMT References: <1995Aug26.225200.8003@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug26.225200.8003@mit.edu>, akarlsson@mit.edu (Anja Karlsson) 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! -- Mateo Ivanov "Measuring a record you own is listening, not piracy." Amiga 1200 (Blizzard 030/50) / System 7.5.1 From osato@cmu.edu Mon Aug 28 23:30:00 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!osato From: osato@cmu.edu (Olga Sato) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug28.233000.7642@cmu.edu> Date: Mon, 28 Aug 1995 23:30:00 GMT References: <1995Aug26.225200.8003@mit.edu> <1995Aug28.031400.5589@kiae.su> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug28.031400.5589@kiae.su>, mivanov@kiae.su (Mateo Ivanov) 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. -- Olga Sato Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From nrodriguez@earthlink.net Tue Aug 29 09:31:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!nrodriguez From: nrodriguez@earthlink.net (Natalia Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug29.093100.3456@earthlink.net> Date: Tue, 29 Aug 1995 09:31:00 GMT References: <1995Aug26.225200.8003@mit.edu> <1995Aug28.031400.5589@kiae.su> <1995Aug28.233000.7642@cmu.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Aug28.233000.7642@cmu.edu>, osato@cmu.edu (Olga Sato) 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. -- Natalia Rodríguez -- EarthLink Network "Marcus is not one man." From ajohansson@inria.fr Tue Aug 29 21:47:00 1995 Path: ashpoly!cascade!bigsur!inria!ajohansson From: ajohansson@inria.fr (Andrei Johansson) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug29.214700.5328@inria.fr> Date: Tue, 29 Aug 1995 21:47:00 GMT References: <1995Aug26.225200.8003@mit.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Aug26.225200.8003@mit.edu>, akarlsson@mit.edu (Anja Karlsson) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Andrei Johansson | ajohansson@inria.fr PGP Key fingerprint: 60DD 247F 1A0D 19E8 "Keep the channels open."