From lsilva@pacbell.net Sat May 18 23:05:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!lsilva From: lsilva@pacbell.net (Lucia Silva) Newsgroups: comp.sys.m68k Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996May18.230533.8307@pacbell.net> Date: Sat, 18 May 1996 23:05:33 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. 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? -- Lucia Silva Hayes Optima 288 @ 33,600 bps "Measuring a record you own is listening, not piracy." From bpark@ox.ac.uk Sun May 19 11:41:33 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!bpark From: bpark@ox.ac.uk (Bill Park) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996May19.114133.4222@ox.ac.uk> Date: Sun, 19 May 1996 11:41:33 GMT References: <1996May18.230533.8307@pacbell.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May18.230533.8307@pacbell.net>, lsilva@pacbell.net (Lucia Silva) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- === Bill Park === Dept of Electrical Engineering, Oxford University Computing Laboratory "A soul is not exclusive to biology."