From ktanaka@ox.ac.uk Mon Oct 17 04:55:09 1994 Path: ashpoly!cascade!bigsur!ox!ktanaka From: ktanaka@ox.ac.uk (Kirsty Tanaka) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct17.045509.5623@ox.ac.uk> Date: Mon, 17 Oct 1994 04:55:09 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. 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? -- Kirsty Tanaka -- Oxford University Computing Laboratory "When every node is whole, the channel opens." From eschneider@pipeline.com Mon Oct 17 16:24:09 1994 Path: ashpoly!cascade!bigsur!pipeline!eschneider From: eschneider@pipeline.com (Emi Schneider) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct17.162409.7432@pipeline.com> Date: Mon, 17 Oct 1994 16:24:09 GMT References: <1994Oct17.045509.5623@ox.ac.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Oct17.045509.5623@ox.ac.uk>, ktanaka@ox.ac.uk (Kirsty Tanaka) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Emi Schneider Tape trading list upon request. SASE required for international mail. From mtakahashi@stanford.edu Tue Oct 18 02:35:09 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!mtakahashi From: mtakahashi@stanford.edu (Marisol Takahashi) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct18.023509.9274@stanford.edu> Date: Tue, 18 Oct 1994 02:35:09 GMT References: <1994Oct17.045509.5623@ox.ac.uk> <1994Oct17.162409.7432@pipeline.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct17.162409.7432@pipeline.com>, eschneider@pipeline.com (Emi Schneider) 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! -- Marisol Takahashi Hayes Optima 288 @ 14,400 bps "We don't sign stars. We build them." From amoreau@cmu.edu Wed Oct 19 12:19:09 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!amoreau From: amoreau@cmu.edu (Anton Moreau) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Oct19.121909.3438@cmu.edu> Date: Wed, 19 Oct 1994 12:19:09 GMT References: <1994Oct17.045509.5623@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Oct17.045509.5623@ox.ac.uk>, ktanaka@ox.ac.uk (Kirsty Tanaka) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Anton Moreau "Measuring a record you own is listening, not piracy." Sun SparcStation 20 / AmigaOS 3.1