From ngirard@delphi.com Sun Apr 02 08:50:55 1995 Path: ashpoly!cascade!brgate!saturno!delphi!ngirard From: ngirard@delphi.com (Nadine Girard) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr02.085055.5119@delphi.com> Date: Sun, 02 Apr 1995 08:50:55 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 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. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Did Marcus take the decryption EPROM with him when he left the lab? -- Nadine Girard Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From isilva@titech.ac.jp Sun Apr 02 20:29:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!isilva From: isilva@titech.ac.jp (Ines Silva) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr02.202955.9143@titech.ac.jp> Date: Sun, 02 Apr 1995 20:29:55 GMT References: <1995Apr02.085055.5119@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Apr02.085055.5119@delphi.com>, ngirard@delphi.com (Nadine Girard) writes: > 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Ines Silva *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From smacdonald@inria.fr Sun Apr 02 23:47:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!smacdonald From: smacdonald@inria.fr (Seo-yeon MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr02.234755.1731@inria.fr> Date: Sun, 02 Apr 1995 23:47:55 GMT References: <1995Apr02.085055.5119@delphi.com> <1995Apr02.202955.9143@titech.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr02.202955.9143@titech.ac.jp>, isilva@titech.ac.jp (Ines Silva) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Seo-yeon MacDonald Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From kpetrov@stanford.edu Mon Apr 03 10:54:55 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!kpetrov From: kpetrov@stanford.edu (Karen Petrov) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr03.105455.8249@stanford.edu> Date: Mon, 03 Apr 1995 10:54:55 GMT References: <1995Apr02.085055.5119@delphi.com> <1995Apr02.202955.9143@titech.ac.jp> <1995Apr02.234755.1731@inria.fr> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr02.234755.1731@inria.fr>, smacdonald@inria.fr (Seo-yeon MacDonald) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Karen Petrov "Do not worship the copy." Amiga 1200 (Blizzard 030/50) / Linux 1.2.13 From kchoi@netcom.com Tue Apr 04 01:47:55 1995 Path: ashpoly!cascade!bigsur!netcom!kchoi From: kchoi@netcom.com (Kirsty Choi) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr04.014755.2437@netcom.com> Date: Tue, 04 Apr 1995 01:47:55 GMT References: <1995Apr02.085055.5119@delphi.com> <1995Apr02.202955.9143@titech.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Apr02.202955.9143@titech.ac.jp>, isilva@titech.ac.jp (Ines Silva) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Kirsty Choi Tape trading list upon request. SASE required for international mail.