Cyber security and privacy protects for data information from adversarial disclosure or usage. Cyber communications intervolves with the Internet, cellular networks, city/community Wi-Fi mesh, satellite, vehicle networks, body networks, personal networks, enterprise and private networks, and many others. Cyber-attacks are currently prevailing in all these networks, user networking devices, and the applications. They are even more complex and malicious in the distributed and mobile environment. Consequently, the detections and preventions of these cyber-attacks are unprecedentedly complicated. Eavesdropping, signaling jamming, DoD, sinkholes, Sybil, wormholes, spoofing, flooding, trust poisoning are old security problems but they are still challenging our brain. On the other hands, new malwares are emerging every day and they are even more stealthy and intelligent, and targeting the vulnerabilities of OSs, browsers, and applications. Moreover, new network protocols and applications open new channels for adversaries to take advantage. Data leaks, is becoming one of the main security concerns, especially when we are living in a virtual world built on top of social networks, cloud infrastructure, and smart mobile devices.