How To: Use Bluetooth Technology
information on bluetoothThe radio frequency that bluetooth operates on is usually 2.45 gigahertz (it ranges from about 2.40 to 2.48). This is a rather low frequency, which explains the limited range. Nevertheless, because it uses radio signals, the walls in your home will not impede a bluetooth network. Also, it makes controlling devices in different rooms very easy.
In fact, a bluetooth gadget can simultaneously control up to seven other devices, although only one connection can be active at the time. Such a network involving a master and its "slaves" is called a piconet .
It's possible to configure the devices to have password-protected connections to prevent people from sneaking into your communications. Also, devices can be set up to constantly announce their presence to nearby devices, so that connections can be automatically established.
security issuesThis new type of networking raises security-related concerns. In 2004, a group of researchers experimented with a virus transmitted through mobile phones. While this wasn't a genuine cyber-attack, they demonstrated that it's theoretically possible that one might occur.
In addition, an experiment with directional antennae extended the range of bluetooth devices to one mile. This technique, called "bluetooth sniping," could let hackers attack vulnerable devices from farther than expected.
Similarly, there's a new phenomenon called "bluejacking," which consists of people sending unsolicited messages to your bluetooth device. Fortunately, there's no actual hijacking involved; your personal information cannot be stolen and you always remain in control of your own device.