Patent ID: 6286105
Filing Date: 2001-09-04
Classification: G06F

Abstract:
In a modem employing a communication protocol capable of modulation modification utilizing a standard scrambler, a method of implementing link level security to enforce access privileges between a calling modem and an answering modem over a communication channel during a communication session, comprising the steps of:a) exchanging at least one security scrambler descriptor from said calling modem to said answering modem, said descriptor uniquely identifying a security scrambler known to both said calling modem and said answering modem, said security scrambler differing from said standard scrambler;b) verifying at said answering modem that said security scrambler designated by said at least one security scrambler descriptor from said calling modem was previously assigned to said calling modem;c) training with said security scrambler said communication channel between said calling modem and said answering modem to optimize transmission parameters therebetween; andd) modifying said modulation of data using said security scrambler between said calling modem and said answering modem during a data transmission phase of said communication session, said modifying said modulation of data using said security scrambler step further comprises the step of hopping from said security scrambler to a second security scrambler also common to both said calling modem and said answering modem upon the occurrence of a predetermined condition.