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The WLAN is a network that utilizes radio frequency technology. The security of wireless data stream becomes particularly prominent. The WLAN uses RC4 stream encryption algorithm of the WEP protocol to enhance its Security. WEP itself also has fatal Security flaws, tampering with the data for a variety of active attacks. In essence, the problem is not in RC4 itself but in the way to generate the key and how to use the key for RC4 encryption. Many hacker and computer security experts have discovered the WEP design flaws, which indicate that IEEE 802.11 standard can only provide limited support to confidentiality, WEP provides a 40-bit key which may be sufficient to keep away a common hacker but in capable to ward of professional hacker.
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