From aramirez@inria.fr Wed Feb 01 14:09:47 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!aramirez From: aramirez@inria.fr (Amy Ramírez) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb01.140947.3158@inria.fr> Date: Wed, 01 Feb 1995 14:09:47 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Did Marcus take the decryption EPROM with him when he left the lab? -- Amy Ramírez Practical Peripherals 14.4 @ 14,400 bps "Extraordinary claims require extraordinary spectra." From ksokolov@uni-hamburg.de Thu Feb 02 03:56:47 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!ksokolov From: ksokolov@uni-hamburg.de (Karen Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb02.035647.6879@uni-hamburg.de> Date: Thu, 02 Feb 1995 03:56:47 GMT References: <1995Feb01.140947.3158@inria.fr> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb01.140947.3158@inria.fr>, aramirez@inria.fr (Amy Ramírez) 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. PGP Public key available via finger or upon request. -- Karen Sokolov -- Universität Hamburg Fachbereich Informatik "Hold for relay." From eramirez@unam.mx Thu Feb 02 18:27:47 1995 Path: ashpoly!cascade!mxgate!coyoacan!unam!eramirez From: eramirez@unam.mx (Elaine Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb02.182747.2855@unam.mx> Date: Thu, 02 Feb 1995 18:27:47 GMT References: <1995Feb01.140947.3158@inria.fr> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb01.140947.3158@inria.fr>, aramirez@inria.fr (Amy Ramírez) 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. -- Elaine Ramírez | eramirez@unam.mx PGP Key fingerprint: BCB9 FCFA 98EE 7440 "Keep the channels open." From ghughes@mit.edu Sat Feb 04 09:58:47 1995 Path: ashpoly!cascade!brgate!saturno!mit!ghughes From: ghughes@mit.edu (Graham Hughes) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb04.095847.8984@mit.edu> Date: Sat, 04 Feb 1995 09:58:47 GMT References: <1995Feb01.140947.3158@inria.fr> <1995Feb02.035647.6879@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb02.035647.6879@uni-hamburg.de>, ksokolov@uni-hamburg.de (Karen Sokolov) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Graham Hughes -- Massachusetts Institute of Technology "They will send a copy in my place."