초록 ▼

Rather than including a static network descriptor in messages transmitted between master and slave Bluetooth-enabled devices communicating on a piconet, which network descriptor is computed as a known function of the master's Bluetooth address (BD_ADDR), the network descriptor is changed each time a

Rather than including a static network descriptor in messages transmitted between master and slave Bluetooth-enabled devices communicating on a piconet, which network descriptor is computed as a known function of the master's Bluetooth address (BD_ADDR), the network descriptor is changed each time a new session beings on one of the devices. This prevents an intentional eavesdropper, who may be in proximity to the piconet and who may be listening for and detecting the network descriptor included within these messages, from associating a detected network descriptor with a particular device of a user and thereafter using that network descriptor to track the location of the user who is carrying and using that device. The network descriptor, the channel access code (CAC), is changed each time a new session begins by computing it as a known function of a seed and the master's BD_ADDR, wherein the seed is a random number chosen at the beginning of each new session by the master. For further security, CAC is changed not only when a new session begins but within each session on a periodic basis. For the latter, the seed is a combination of the random number generated for each session by the master and a time parameter associated with the master.

대표청구항 ▼

Rather than including a static network descriptor in messages transmitted between master and slave Bluetooth-enabled devices communicating on a piconet, which network descriptor is computed as a known function of the master's Bluetooth address (BD_ADDR), the network descriptor is changed each time a

Rather than including a static network descriptor in messages transmitted between master and slave Bluetooth-enabled devices communicating on a piconet, which network descriptor is computed as a known function of the master's Bluetooth address (BD_ADDR), the network descriptor is changed each time a new session beings on one of the devices. This prevents an intentional eavesdropper, who may be in proximity to the piconet and who may be listening for and detecting the network descriptor included within these messages, from associating a detected network descriptor with a particular device of a user and thereafter using that network descriptor to track the location of the user who is carrying and using that device. The network descriptor, the channel access code (CAC), is changed each time a new session begins by computing it as a known function of a seed and the master's BD_ADDR, wherein the seed is a random number chosen at the beginning of each new session by the master. For further security, CAC is changed not only when a new session begins but within each session on a periodic basis. For the latter, the seed is a combination of the random number generated for each session by the master and a time parameter associated with the master. etween impedance of the diode and impedance of the antenna when the signal is applied across the antenna circuit, which selectively tunes the antenna circuit by imparting a desired power transfer therein. In one version, the antenna receives electromagnetic waves in the form of a radio frequency signal from a separate signal source which imparts a signal carried by the antenna to the antenna circuit such that the antenna circuit is powered by the signal. In another version, a separate signal source is provided in electrical communication with the antenna circuit such that the antenna circuit is powered by the signal source, preferably an oscillating source, which drives the antenna to produce transmitting electromagnetic waves. 6/038410, WO; WO96/041043, WO; WO96/022971, WO; WO97/009272, WO; WO97/031139, WO; WO97/043473, WO; WO98/026871, WO; WO98/039250, WO; WO98/039251, WO; WO98/042620, WO; WO98/048456, WO; WO99/006618, WO; WO 00/09443, WO; WO 00/08650, WO; WO99/047570, WO; WO99/048810, WO; WO99/058748, WO; WO99/065821, WO; WO 00/09443, WO; WO 00/17101, WO; WO 00/19494, WO; WO 00/63115, WO; WO 00/73204, WO; WO 01/03208, WO; WO 00/44094, WO; WO 00/048195, WO; WO 01/18246, WO; WO 01/23303, WO; WO 01/03208, WO; WO 02/37500, WO; WO 02/19420, WO; WO 02/38496, WO; WO 02/42204, WO; WO 02/48701, WO; WO 02/48822, WO; WO 02/054505, WO; WO 02/059898, WO; WO 02/060812, WO; WO 02/060813, WO