Textbook in PDF format In the recent years we have huge development of wireless technology. We are presently getting more subject to wireless technology. As we know wireless networks have broadcast nature so there are different security issues in the wireless communication. The security conventions intended for the wired systems can't be extrapolated to wireless systems. Hackers and intruders can make utilization of the loopholes of the wireless communication. Various aspects of the security of wireless communications are extremely important for the successful operation and widespread adoption of modern information technologies. Wireless communications have special requirements and vulnerabilities, and therefore are of special concern. In particular, wireless networks are vulnerable to malicious attacks and the number of potential threats has been increasing dramatically. Recently, considerable novel challenges have emerged in view of the rapid growth of advanced applications of wireless communications in commercial and industrial domains embracing Wireless Sensor Networks and the Internet of Things. Wireless communication provides a lot of advantages due to increased accessibility. But, at the same time, it is sensible to many security risks. If a message is not encrypted with a strong algorithm or security protocol, one can easily access it since all the communication takes place in air. In wired networks, the physical transmission medium can be secured, but the wireless networks uses air as a transmission medium. This enables easy access to transmitted data. The mobility of the wireless networks also causes problems. The transmission of signal through air and the mobility of users bring the era of wireless network. Thus, issue of privacy and security concern becomes most important with the wireless networks. This book presents an overview of security for mobile and wireless communication. In this book we will mull over the different remote security dangers to wireless systems and conventions at present accessible like Wired Equivalent Privacy (WEP), Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access 2 (WPA2). In order to overcome these challenges, it is vitally important to develop a range of novel approaches as well as sophisticated combinations of useful and efficient security techniques. Relevant security measures include data encryption and device and user authentication. Privacy-preserving data mining is also essential for secure analysis of the big data pertaining to wireless communications