To improve the security of Wireless Local Area Networks, the IEEE has recently standardized the 802.11i protocol. The 802.11i is based on two main components. It uses a new protocol, called CCMP for data-confidentiality and IEEE 802.11X’s Key-distribution system to control access to the network. In CCMP, a packet is sent in clear for decryption possibility by the receiver. To avoid security flaws, the counter is not used more than once. This makes the protocol dependent on 802.11X standard. It also leads the performance to degrade. In this paper, a new encryption method is introduced that eliminates counter transmission and based on numerical calculations this method improves the security of CCMP method.

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