From nnakamura@hanse.de Fri Jul 21 08:47:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!nnakamura From: nnakamura@hanse.de (Natalia Nakamura) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul21.084711.7432@hanse.de> Date: Fri, 21 Jul 1995 08:47:11 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. -- Natalia Nakamura -- Hanse-Netzwerk Hamburg "Marcus is not one man." From kstewart@mit.edu Fri Jul 21 10:41:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!kstewart From: kstewart@mit.edu (Karen Stewart) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul21.104111.1079@mit.edu> Date: Fri, 21 Jul 1995 10:41:11 GMT References: <1995Jul21.084711.7432@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jul21.084711.7432@hanse.de>, nnakamura@hanse.de (Natalia Nakamura) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Karen Stewart US Robotics Courier V.34 @ ISDN 64k bps "In theory there is no difference between theory and practice." From avasiliev@clari.net Sat Jul 22 03:08:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!avasiliev From: avasiliev@clari.net (Anja Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul22.030811.9484@clari.net> Date: Sat, 22 Jul 1995 03:08:11 GMT References: <1995Jul21.084711.7432@hanse.de> <1995Jul21.104111.1079@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul21.104111.1079@mit.edu>, kstewart@mit.edu (Karen Stewart) 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. -- Anja Vasiliev | avasiliev@clari.net PGP Key fingerprint: F309 8675 ABEE 0C74 "Keep the channels open."