The Bluetooth is a wireless interface that enables electronic devices to establish short-range, ad-hoc wireless connections. This kind of short-range wireless networking is known as Wireless Personal Area Networks (WPANs). Because of its attractive features of small size, low cost and low power, Bluetooth gains a worldwide usage. It is embedded in many portable computing devices and considered as a good replacement for local wire connections. Since wireless data is inherently exposed to eavesdropping, the security and confidentiality is a central issue for wireless standard as well as Bluetooth. To maintain security and confident-totality of wireless packets, the Bluetooth system mainly relies on the frequency hopping mechanism to equivocate an adversary.