自学软件工程师要多久:Study of Wifi Sequrity (1)

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1.Wireless Lan Organization IEEE802.11 include infrastructure and ad-hoc 2. Basic in infrastructure1) power on AP AP advertise its presence by send beacons at a regular interval , about 10 times a second. And in one channel.2) Sta scanning Because there is a number of different radio frequencies(channels), so the STA must tune into each channel in turn and listen for beacon messages.3) Sta probing Because scanning is too slow, so if we want to accelerate the process , we can send probe message.4) authentication Sta AP authenticate request msg ------------------------> authenticate response <------------------------ 5) Association Sta AP association request --------------------> assoication response 3. IEEE 802.11 messages1) Control: 2) Management: Sta and AP used to negotiate and control their relationship.3) Data 4. General Frame Formats Preamble + pldp + mac + user date + crc 1) Mac ad-hoc SA+DA AP -> Sta SA + TA + DA Sta -> AP SA + RA + DA2) Management Frame Fixed Fields + Elem1 + Elem2 ... + Elemn

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