From deriksson@inria.fr Thu Nov 02 19:02:39 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!deriksson From: deriksson@inria.fr (Diego Eriksson) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov02.190239.1605@inria.fr> Date: Thu, 02 Nov 1995 19:02:39 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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. -- Diego Eriksson *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From flarsson@cmu.edu Sat Nov 04 17:08:39 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!flarsson From: flarsson@cmu.edu (Freya Larsson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Nov04.170839.1073@cmu.edu> Date: Sat, 04 Nov 1995 17:08:39 GMT References: <1995Nov02.190239.1605@inria.fr> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Nov02.190239.1605@inria.fr>, deriksson@inria.fr (Diego Eriksson) 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. -- Freya Larsson Tape trading list upon request. SASE required for international mail.