While offering many advantages, the wireless communication is associated with many security issues and threats. In wireless environment, security is a vital issue both for the providers and users of the wireless system. In wireless communication system, many common characteristics are shared with a traditional wireless networks and thus causes many security issues. While superseding the disadvantages of the wired networks by eliminating the cable cost and increased user mobility, wireless network also encounter serious security concern. This paper presents an overview of security for mobile and wireless communication.