From roliveira@uu.net Fri Jun 02 22:32:16 1995 Path: ashpoly!cascade!brgate!saturno!uu!roliveira From: roliveira@uu.net (Raj Oliveira) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun02.223216.3218@uu.net> Date: Fri, 02 Jun 1995 22:32:16 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Raj Oliveira US Robotics Courier V.34 @ 9600 Telebit bps "A soul is not exclusive to biology." From trodriguez@netcom.com Sun Jun 04 16:23:16 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!trodriguez From: trodriguez@netcom.com (Takeshi Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun04.162316.1240@netcom.com> Date: Sun, 04 Jun 1995 16:23:16 GMT References: <1995Jun02.223216.3218@uu.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun02.223216.3218@uu.net>, roliveira@uu.net (Raj Oliveira) 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. -- Takeshi Rodríguez "5 sigma is a discovery. 7 is a question." Sun SparcStation 20 / TOS 4.04