From tlaurent@mindspring.com Wed Apr 10 00:55:15 1996 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!tlaurent From: tlaurent@mindspring.com (Tomas Laurent) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Apr10.005515.7046@mindspring.com> Date: Wed, 10 Apr 1996 00:55:15 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 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. -- Tomas Laurent "When every node is whole, the channel opens." Atari Falcon 030 / AmigaOS 3.1 From teriksson@inria.fr Thu Apr 11 02:56:15 1996 Path: ashpoly!cascade!bigsur!inria!teriksson From: teriksson@inria.fr (Tobias Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Apr11.025615.8262@inria.fr> Date: Thu, 11 Apr 1996 02:56:15 GMT References: <1996Apr10.005515.7046@mindspring.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Apr10.005515.7046@mindspring.com>, tlaurent@mindspring.com (Tomas Laurent) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Tobias Eriksson "Hold for relay." NeXTstation Turbo Color / NEXTSTEP 3.3