tailieunhanh - wifi security phần 4

rong cuộc tấn công ban đầu, khoảng IV độc đáo đã được yêu cầu để tìm chìa khóa bí mật. Sau đó, vào năm 2002, David Hulton xuất bản một bài báo [19] làm thế nào để tối ưu hóa cuộc tấn công. Thực hiện của ông về cuộc tấn công và tối ưu hóa yêu cầu chỉ vào | . SOFTWARE TOOLS 17 Beacon interval is the time between each transmitted beacon frame typically 100 1024us 100ms . Service Set Identity SSID a string of maximum 32 bytes characters that gives a human readable identification of a Wi-Fi network. It also serves another purpose to group together multiple access points to form a network of collaberating access points. Supported rates a list of supported transmit rates in the network. Extended supported rates other supported rates. Channel the channel the network is operating on. The Basic Service Set Identifier BSSID discloses information about who manufactured the access point. The first 16bits of the BSSID can be looked up from an IEEE database 10 Summary Available information from passively capturing ordinary Wi-Fi traffic is compiled in Table Table Information available from an analysis of Wi-Fi frames. Fact Frame Requirements WDS Data 1 frame Ad-hoc Infrastructure Beacon Probe Data 1 frame Network range Any 3 frames and GPS Client Access point location Any 3 frames and GPS WEP Beacon Probe Data 1 frame WPA Beacon Probe Data 1 frame SSID Beacon Probe 1 frame Access point MAC address Any 1 frame Client MAC address Probe Request Data 1 frame Wired client MAC address Data 1 frame Contents of data Data Intelligent guess Software Tools Software is equally as important as the hardware involved in capturing information about Wi-Fi networks. Software tools described in the following sections reduce the 18 CHAPTER 2. HOW TO IDENTIFY WI-FI NETWORKS amount of effort needed for anyone to study a network. There are different tools for different purposes some tools such as Kismet give a good overview over a network or several networks while others like Ethereal give details about every byte or even bit of a packet. Another tool called Ettercap makes it easy to follow connections which consists of related packets. Altough as pointed out its possible to learn a great deal about a network from its beacon frames.

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