From snilsson@panix.com Sat Jun 03 04:56:02 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!snilsson From: snilsson@panix.com (Steve Nilsson) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun03.045602.5378@panix.com> Date: Sat, 03 Jun 1995 04:56:02 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Did Marcus take the decryption EPROM with him when he left the lab? -- Steve Nilsson *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From smuller@clari.net Sun Jun 04 23:05:02 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!smuller From: smuller@clari.net (Sven Müller) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun04.230502.4642@clari.net> Date: Sun, 04 Jun 1995 23:05:02 GMT References: <1995Jun03.045602.5378@panix.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun03.045602.5378@panix.com>, snilsson@panix.com (Steve Nilsson) writes: > 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. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Sven Müller "Tape doesn't lie at 02:14. Ears do." Atari Falcon 030 / AmigaOS 3.1 From jchoi@purdue.edu Tue Jun 06 18:32:02 1995 Path: ashpoly!cascade!brgate!saturno!purdue!jchoi From: jchoi@purdue.edu (Jen Choi) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun06.183202.3429@purdue.edu> Date: Tue, 06 Jun 1995 18:32:02 GMT References: <1995Jun03.045602.5378@panix.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun03.045602.5378@panix.com>, snilsson@panix.com (Steve Nilsson) writes: > 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. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Jen Choi Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------