een as much publicity about tooth class 3 transmitter at 0 dBm is harder to intercept cracking Bluetooth, as was the case with 802.11, it is from afar than an 802.11 access point at 20-dBm trans- prudent to use higher layer security (VPN or SSL, etc.) if mit power. The second is related to the usage of the large amounts of sensitive data are to be transferred over devices. Most 802.11 devices are connected to a local a Bluetooth link. network of some kind, which provides many resources of interest to an attacker: servers containing possibly valu- 5.1.5.2 Enhanced PANs: 802.15.3 able data and a likely connection to the global Internet. Many Bluetooth devices may only provide access to The 802.15.3 task group was created to enhance the a single data stream or a few neighbor devices. The capabilities of 802.15.1 (Bluetooth) while preserving attacker who intercepts data sent to a printer from a few the architecture, voice support, low cost of imple- meters away might just as well walk over to the printer mentation, and range of the original. Data rates as high as and look at what's coming out. Finally, any given Blue- 55 Mbps were targeted to allow applications such as tooth link is likely to be used less intensively and provides streaming audio and video, printing high-resolution a lower peak data rate than an 802.11 link, SO an attacker images, and transmitting presentations to a digital pro- has a harder time gathering data to analyze. jector (Table 5.1-3). Because the work was now under That being said, Bluetooth provides security services the aegis of the IEEE, the group sought to create a PHY that are in some ways superior to those in 802.11. with some compatibility with existing 802.11 devices; Wireless local area networks CHAPTER 5. 1 Table 5.1-3 802.15.3 Data Rates. Modulation Coding Code rate Data rate (Mbps) Sensitivity (dBm) DQPSK 16QAM 32QAM 64QAM thus a symbol rate of 11 Msps was chosen, and the channels into the U.S. ISM band, providing more flexi- channels were to be compatible with the 5-MHz 802.11 b