From cokonkwo@purdue.edu Sat Aug 13 18:28:16 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!cokonkwo From: cokonkwo@purdue.edu (Callum Okonkwo) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug13.182816.1886@purdue.edu> Date: Sat, 13 Aug 1994 18:28:16 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Hardware disassembly report for Motorola hardware hackers. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Did Marcus take the decryption EPROM with him when he left the lab? -- Callum Okonkwo "Tape doesn't lie at 02:14. Ears do." Sun 3/60 (SunOS 4.1.1) / System 7.5.1 From mschneider@cam.ac.uk Mon Aug 15 03:49:16 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!mschneider From: mschneider@cam.ac.uk (Matthias Schneider) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Aug15.034916.7315@cam.ac.uk> Date: Mon, 15 Aug 1994 03:49:16 GMT References: <1994Aug13.182816.1886@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug13.182816.1886@purdue.edu>, cokonkwo@purdue.edu (Callum Okonkwo) writes: > Hardware disassembly report for Motorola hardware hackers. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Matthias Schneider -- University of Cambridge Computer Laboratory "Marcus is not one man."