Date Added: Sep 2011
Recently, wireless communication has been popularly used in the people everyday life. However, its security is a crucial work since messages are broadcasted via wireless channels through which hackers can intercept the massages and then know the contents of the messages. That is why security has been one of the most important issues in wireless communication studies. Encrypting messages to cipher-text is one of the methods to solve this problem. But, it also causes another problem, i.e., how to safely and confidentially encrypt and deliver security keys so that hackers have to spend a very long time before they can decrypt the cipher-text.