07293282 is referenced by 36 patents and cites 22 patents.

The present invention teaches methods and systems for blocking unauthorized access to cable modem configuration files stored on trivial file transfer protocol (TFTP) servers. Filenames are modified by the DHCP to incorporate an authentication key (and optional cloaking) prior to transmission to the cable modem. When the TFTP server receives a modified filename, it also generates an authentication key. The authentication keys must match in order for the cable modem to receive the configuration file requested. At a minimum, authentication keys depend upon the un-modified filename, the cable modem IP address and a “coordination pass phrase” known to the TFTP server and DHCP server, but not known to the cable modem. Variations include optional cloaking, various actions performed for non-matching authentication keys, selection of authentication key generating algorithm and inclusion of cable modem MAC address in the authentication key for all cable modems or for premium service customer cable modems.

Title
Method to block unauthorized access to TFTP server configuration files
Application Number
10/613659
Publication Number
7293282 (B2)
Application Date
July 3, 2003
Publication Date
November 6, 2007
Inventor
Kenneth Gould
Oakton
VA, US
Andrew Danforth
Herndon
VA, US
Agent
Roberts Mardula & Wertheim
Assignee
Time Warner Cable
CT, US
IPC
H04L 9/00
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