From msato@kiae.su Wed Jul 05 21:13:02 1995 Path: ashpoly!cascade!brgate!saturno!kiae!msato From: msato@kiae.su (Mikhail Sato) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul05.211302.2253@kiae.su> Date: Wed, 05 Jul 1995 21:13:02 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 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. 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? -- Mikhail Sato *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From lnakamura@pipeline.com Thu Jul 06 16:35:02 1995 Path: ashpoly!cascade!bigsur!pipeline!lnakamura From: lnakamura@pipeline.com (Liam Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul06.163502.6531@pipeline.com> Date: Thu, 06 Jul 1995 16:35:02 GMT References: <1995Jul05.211302.2253@kiae.su> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul05.211302.2253@kiae.su>, msato@kiae.su (Mikhail Sato) 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! -- Liam Nakamura "When every node is whole, the channel opens." Commodore Amiga 500 (1MB OCS) / AmigaOS 3.1 From csmirnov@u-tokyo.ac.jp Fri Jul 07 11:14:02 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!csmirnov From: csmirnov@u-tokyo.ac.jp (Callum Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul07.111402.1626@u-tokyo.ac.jp> Date: Fri, 07 Jul 1995 11:14:02 GMT References: <1995Jul05.211302.2253@kiae.su> <1995Jul06.163502.6531@pipeline.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jul06.163502.6531@pipeline.com>, lnakamura@pipeline.com (Liam Nakamura) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Callum Smirnov *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From mweber@netcom.com Fri Jul 07 22:50:02 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!mweber From: mweber@netcom.com (Matthias Weber) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul07.225002.9743@netcom.com> Date: Fri, 07 Jul 1995 22:50:02 GMT References: <1995Jul05.211302.2253@kiae.su> <1995Jul06.163502.6531@pipeline.com> <1995Jul07.111402.1626@u-tokyo.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul07.111402.1626@u-tokyo.ac.jp>, csmirnov@u-tokyo.ac.jp (Callum Smirnov) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- === Matthias Weber === Dept of Electrical Engineering, NETCOM On-Line Communication Services "We don't sign stars. We build them."