From mlaurent@utexas.edu Sun Apr 24 19:22:21 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!mlaurent From: mlaurent@utexas.edu (Mei Laurent) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr24.192221.4460@utexas.edu> Date: Sun, 24 Apr 1994 19:22:21 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Mei Laurent -- University of Texas at Austin "Do not worship the copy." From anilsson@utexas.edu Mon Apr 25 09:28:21 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!anilsson From: anilsson@utexas.edu (Andrei Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr25.092821.3177@utexas.edu> Date: Mon, 25 Apr 1994 09:28:21 GMT References: <1994Apr24.192221.4460@utexas.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr24.192221.4460@utexas.edu>, mlaurent@utexas.edu (Mei Laurent) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Andrei Nilsson "There are 14 nodes and only 10 countries. Count again." Decstation 5000/200 / System 7.5.1 From aeriksson@uni-hamburg.de Mon Apr 25 16:40:21 1994 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!aeriksson From: aeriksson@uni-hamburg.de (Andrei Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr25.164021.4408@uni-hamburg.de> Date: Mon, 25 Apr 1994 16:40:21 GMT References: <1994Apr24.192221.4460@utexas.edu> <1994Apr25.092821.3177@utexas.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Apr25.092821.3177@utexas.edu>, anilsson@utexas.edu (Andrei Nilsson) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Andrei Eriksson Tape trading list upon request. SASE required for international mail. From srodriguez@rwth-aachen.de Mon Apr 25 22:51:21 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!srodriguez From: srodriguez@rwth-aachen.de (Sergei Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr25.225121.3214@rwth-aachen.de> Date: Mon, 25 Apr 1994 22:51:21 GMT References: <1994Apr24.192221.4460@utexas.edu> <1994Apr25.092821.3177@utexas.edu> <1994Apr25.164021.4408@uni-hamburg.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Apr25.164021.4408@uni-hamburg.de>, aeriksson@uni-hamburg.de (Andrei Eriksson) 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. -- Sergei Rodríguez -- RWTH Aachen Informatik "The hatch is open. Is anyone listening?" From scampbell@u-tokyo.ac.jp Wed Apr 27 01:43:21 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!scampbell From: scampbell@u-tokyo.ac.jp (Sun-mi Campbell) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr27.014321.6626@u-tokyo.ac.jp> Date: Wed, 27 Apr 1994 01:43:21 GMT References: <1994Apr24.192221.4460@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Apr24.192221.4460@utexas.edu>, mlaurent@utexas.edu (Mei Laurent) 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. -- Sun-mi Campbell -- University of Tokyo Department of Information Science "A soul is not exclusive to biology."