【正文】 此外，藍(lán)牙不依賴于用戶，因?yàn)樗梢宰詣?dòng)檢測(cè)并與其他藍(lán)牙設(shè)備無需任何用戶輸入。藍(lán)牙是不依賴于用戶控制或大量電能的一種網(wǎng)絡(luò)技術(shù)。s challengeresponse is simplistic. A oneway challenge for authentication is susceptible to maninthemiddle attacks. Mutual authentication via user verification should be used.The keys used by Bluetooth are weak. The initialization key needs to be more robust and the unit key is a publicgenerated key that can be reused. A set of keys should be used instead.The master key is shared between Bluetooth connections. This key is a broadcast and should have a better scheme than what is used.The encryption algorithm scheme utilized in Bluetooth uses a single algorithm and allows repeat authentication. A more robust method that limits authentication and increases the encryption should be used.Authentication encryption should be increased.Bluetooth implementations normally imit the PIN number range. A PIN number is usually only four digits and the scalability for large environments is difficult.Additional Sources of Information on Bluetooth SecurityFor more information on Bluetooth security, read Bluetooth Security at BlueTomorrow, Bluetooth Protocol and Security Architecture Review by Korak Dasgupta, or Overview of Ad Hoc and Bluetooth Networks.Bluetooth versus Infrared1The major advantages of the Bluetooth technology over other munication technologies are its being cheap, wireless and automatic.1A data transmission technology parable to Bluetooth is IrDA or infrared munication much like what your remote control devices use to control the TV, stereo, air conditioner etc. The big drawback of this type of technology, however, is the requirement that the two devices establishing a connection must be within sight of one another for transmission to take place. You can only control infrared devices by pointing the remote directly at the device or lining up the infrared ports of both IR capable devices.1Bluetooth devices can municate with one another even when they are not in the same room. In fact, even in its low power setting, a Bluetooth device can municate with another device that is within its tenmeter radius regardless of walls, windows, or other physical obstructions.1Infrared technology limits the device munications to one on one. Thus, an IR remote control can control only one electronic device at a time. On the other hand, Bluetooth devices are capable of municating with multiple devices at any given time.1Infrared devices, however, are less susceptible to interference than Bluetooth devices. This means that you can be sure that the data will be sent to the intended recipient without any distortion or inaccuracies. Improvements in the Bluetooth technology however minimizes this problem by enabling the Bluetooth devices to hop frequencies and municate within a specific frequency range. Therefore, although there is still risk of interference, the chances of it happening are very minimal. If such occurs, it will happen only in a very brief period of time and a software will be available to correct any consequent distortion.From：藍(lán)　牙藍(lán)牙技術(shù)又叫哈拉藍(lán)牙，是以1900年的丹麥國(guó)王的名字命名的，寓意鞏固丹麥和挪威的統(tǒng)一。附　錄附錄A　外文資料BluetoothBluetooth technology is named after Harald Bluetooth, a Danish king who managed to consolidate Denmark and a part of Norway in the 1900s. The choice for the name of this technology is a manifestation of how influential and central the panies from this region are to the telemunications industry.Bluetooth is a working technology that does not rely on user control or large amounts of power. By keeping the transmission power to an extremely low setting (1 milliwatt), Bluetooth is ideal for mobile battery operated devices. Moreover, Bluetooth does not rely on the user since it can automatically detect and municate with other Bluetooth devices without any user input.Bluetooth technology relies on two things, a radio frequency technology and the protocol software enabling it to transmit data to other devices. Bluetoothcapable devices can transmit data to other devices not within the line of sight of the user. It also enables different devices to municate using certain rules such as the amount of data that will be sent, the type of munication between the devices and the radio frequency or frequencies this munication will take place. These protocols ensure that Bluetooth devices experience the least amount of interference from other Bluetooth capable objects while municating with each other.Bluetooth RF PropertiesLow energy radio waves are the principal transmission system in Bluetooth working. The frequency of Bluetooth capable devices ranges from GHz to as high as GHz, a frequency range specifically reserved by international agreement for ISM or medical, industrial and scientific devices.Transmission CapabilitiesOther devices in the market that use the same ISM band are garage door openers, cordless phones, baby monitors, etc and all these devices contribute to the increase in the risk of interference among Bluetooth devices. To avoid this, Bluetooth devices only use about 1 miliwatt of power in transmitting its signals. This makes the effective range of a Bluetooth device about 32 feet or ten meters and thus limits the chances of interference from other nearby devices.Nevertheless, the low transmission power requirement of Bluetooth devices make them capable of municating with other Bluetooth devices not within their range of sight. This means that a Bluetooth device can still connect to a personal puter for file transfers even if the puter is in an entirely different room in the house.Bluetooth is not a oneonone data transmission technology so it can municate with up to eight devices within its transmission radius at one time. A Bluetooth device will use at most 1600 different and randomly chosen frequencies every second within the course of its trans