From jgarcia@unam.mx Fri Apr 01 16:47:56 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!jgarcia From: jgarcia@unam.mx (Julien García) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr01.164756.6904@unam.mx> Date: Fri, 01 Apr 1994 16:47:56 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Julien García Hayes Optima 288 @ 33,600 bps "5 sigma is a discovery. 7 is a question." From ktakahashi@u-tokyo.ac.jp Sat Apr 02 14:03:56 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!ktakahashi From: ktakahashi@u-tokyo.ac.jp (Kirsty Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Apr02.140356.8626@u-tokyo.ac.jp> Date: Sat, 02 Apr 1994 14:03:56 GMT References: <1994Apr01.164756.6904@unam.mx> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Apr01.164756.6904@unam.mx>, jgarcia@unam.mx (Julien García) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Kirsty Takahashi *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0