Support the new environment: the security of wireless LANs – Wireless LAN – Netw
The development of wireless networks, security is the focus of all the problems, though standards such as 802.11i and other safety measures are added to enhance the security of wireless networks solved the existing wireless network security defects and hazards, while improving the safety standards, has greatly promoted the WLAN application. However, not just network security authentication mechanisms and encryption, but also intrusion detection, Firewall With other technologies to common security, wireless LAN security, therefore need to consider multi-level, comprehensive utilization of various technologies.
As the wireless channel as a transmission medium to a computer local area network (WLAN), wireless local area network is based on the development of cable networks up to a computer with Internet mobility, fast, easy solution is not easy to achieve wire The network channel connectivity problems.
Wireless LAN Standard IEEE802.11 standard as early as November 26, 1997 released. IEEE802.11 MAC layer provides a uniform, making a variety of wireless products from different vendors can be interconnected. Physical layer standard defines two RF (radio frequency) transmission method and an infrared transmission method. Known as Wi-Fi in the IEEE802.11b standard issued after the wireless LAN is a real promotion.
1999 , IEEE802.11 wireless LAN standard working group has released two expansion of the physical layer specification, that is, IEEE802.11b, IEEE802.11a, 2003 years and released IEEE802.11g standard. Table 1 for three different expansion of the standard IEEE802.11 Comparison.
802.11a products began in late 2001 in the market, because of their work at a higher frequency, with more non-overlapping sub-channels and higher data communication bandwidth, has been more widely used. The 802.11a standard and the 802.11b standard operating in two completely different bands with completely different modulation techniques, the two are completely incompatible, but can coexist in the same area without any interference.
802.11g has two main features: high rate and is compatible 802.11b. 802.11g standard is the next mainstream wireless LAN standard, which provides high-speed data communication bandwidth, and the cost of providing a more economic mainstream of the original wireless LAN standard compliant.
In addition, IEEE In addition to the development of these three major wireless local area network deal, has also been introduced or proposed to improve the introduction of some new agreement.
2003, China issued a WLAN national standard, this standard is an important part of the Broadband Wireless IP Standard Working Group to develop a new security mechanism?? WLAN Authentication and Privacy Infrastructure (WAPI). WAPI is China's independent intellectual property rights of the wireless LAN standard, which solves the problem of wireless LAN security. The main difference between it and the IEEE802.11 secure encryption technology is different, it is safe for the IEEE802.11 protocol in WEP problems in China's wireless local area network in the proposed national standard GB15629.11 WLAN Security Solutions, the main feature is the public key-based password system certification mechanism, truly mobile terminal (MT) with the wireless access point (AP) between the two-way identification.
In addition, there is another WLAN technology? HomeRF, HomeRF HomeRF Working Group by the development of leadership by the United States Commission on domestic radio, and special design standards for home users. Its main task is for home users to establish interoperable voice and data communications network, which is the PC and consumer electronics equipment, wireless digital communication between the open industry standards. As wireless technology program, which replaces the need for expensive transmission line laying cable home network, the network equipment and Internet applications provide roaming. The standard has greatly promoted the low-cost wireless data network technology, but because of HomeRF and 802.11b occupies the same 2.4GHz frequency band, limited in function and home applications, while 802.11b have made in the field of the status of office So, now HomeRF is not optimistic.
Currently developed by the IEEE 802.11 protocol has become a popular subject WLAN standards, consistent with most products of this agreement, therefore, present it in the market is still dominated (Note: In this paper, the discourse on the WLAN , in addition to highlight things, WLAN are referring 802.11WLAN).
Characteristics of the wireless LAN application
Easy installation General in the network construction, the longest construction period, the greatest impact on the surrounding environment is the network cabling construction works in the construction process, often require Poqiang, threading pipe rack. The biggest advantage of wireless local area network is removed or reduced the workload of network cabling, installation of one or more generally as long as the access point AP (AccessPoint) equipment, can be set up covering the whole building or local area network.
The use of flexible In the cable network, network equipment, network of information points placed in position by the restriction on the location, and once after completion of wireless local area network, wireless network coverage area at any one location can access the network.
Economical Lack of flexibility as cable networks, which requires the network planners to consider possible future development needs, which often leads to default in the initial design of a large number of low utilization of information point, once the network?? More cost the network transformation. The wireless local area network to avoid or reduce the occurrence of the above.
Easy to extend A variety of wireless LAN configuration, can be flexibly chosen. In this way, the wireless local area network can handle only a few customers from small local area network to thousands of users of large networks, while also providing Wireless Coverage Fully functional within the roaming service and other functions.
Over as wireless local area network with many advantages, it has developed very rapidly. In recent years, wireless local area network has been in hospitals, factories and schools and other places not suitable for network routing has been widely used.
The same time, this advantage also brings new challenges, the more important of these challenges is security.
Wireless LAN security risks Present, security has become a wireless local area network (WLAN) encountered in the development of one of the most critical issue. Relative to the wired LAN WLAN, the security of the increase was mainly due to the use of a common carrier of electromagnetic waves to transmit data signals as a result.
As wireless LAN via wireless
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