From tlopez@earthlink.net Thu Jun 01 04:39:20 1995 Path: ashpoly!cascade!bigsur!earthlink!tlopez From: tlopez@earthlink.net (Thiago López) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun01.043920.2992@earthlink.net> Date: Thu, 01 Jun 1995 04:39:20 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 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. -- Thiago López "Do not worship the copy." Amiga 3000T / TOS 4.04 From mkang@uni-hamburg.de Thu Jun 01 17:51:20 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!mkang From: mkang@uni-hamburg.de (Mei Kang) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun01.175120.8034@uni-hamburg.de> Date: Thu, 01 Jun 1995 17:51:20 GMT References: <1995Jun01.043920.2992@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jun01.043920.2992@earthlink.net>, tlopez@earthlink.net (Thiago López) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Mei Kang SupraFAXModem 28.8 @ 14,400 bps "Extraordinary claims require extraordinary spectra."