From tkarlsson@utexas.edu Fri Apr 21 17:06:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!tkarlsson From: tkarlsson@utexas.edu (Tomas Karlsson) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr21.170604.1497@utexas.edu> Date: Fri, 21 Apr 1995 17:06:04 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Tomas Karlsson *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From stanaka@panix.com Sun Apr 23 00:06:04 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!stanaka From: stanaka@panix.com (Sergei Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr23.000604.5760@panix.com> Date: Sun, 23 Apr 1995 00:06:04 GMT References: <1995Apr21.170604.1497@utexas.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr21.170604.1497@utexas.edu>, tkarlsson@utexas.edu (Tomas Karlsson) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Sergei Tanaka | stanaka@panix.com PGP Key fingerprint: 88A5 04B0 2D98 081E "Keep the channels open."