Implementation of Wlan Wep Protocol by Rc4 Algorithm in Vhdl

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. WLAN has become a hot spot of application in the field of telecommunication. To secure WLAN for data transmission, RC4 algorithm is able to provide the advantages of fast performance resource constrained environment. This paper analyzes the security of RC4 algorithm, presents a way to enhance the security of RC4 algorithm and analysis the affection of the enhanced algorithm. RC4 is probably the most widely used stream cipher now a day due to its simplicity and high efficiency. This paper also focuses on the research to enhance RC4 algorithm that includes analyzes the security of RC4 algorithm, presents a way to enhance the security of RC4 algorithm. The data is encrypted by XOR ing data with the key stream which is generated by RC4 algorithm.