From cpetrov@delphi.com Wed Jun 21 13:18:05 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!cpetrov From: cpetrov@delphi.com (Camila Petrov) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun21.131805.1467@delphi.com> Date: Wed, 21 Jun 1995 13:18:05 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Camila Petrov "Tape doesn't lie at 02:14. Ears do." Atari TT030 / TOS 4.04 From esmirnov@berkeley.edu Fri Jun 23 02:25:05 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!esmirnov From: esmirnov@berkeley.edu (Elaine Smirnov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun23.022505.3449@berkeley.edu> Date: Fri, 23 Jun 1995 02:25:05 GMT References: <1995Jun21.131805.1467@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jun21.131805.1467@delphi.com>, cpetrov@delphi.com (Camila Petrov) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Elaine Smirnov | esmirnov@berkeley.edu PGP Key fingerprint: E115 706E 18E6 12E7 "Keep the channels open."