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. Cyber-crime, which includes any criminal activities related to computers and networks, has kept rising and it is now the third most important crime on FBI's priority list. The traditional attacks to email remain as the biggest intrusion factor people are facing, and new attacks are emerging every year with more widespread and destructive. Blackhole exploit kit is the most prevalent web thread in 2012, and it is further replaced by many new exploit kits that grew out of it in 2013. Andr/BBridge-A, the most widely spread Android malware in Trojan family, has infected thousands of mobile devices in last few years. 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. CSP solicits previously unpublished research papers in any aspect of security data analytics, network communication, application, and computer security or privacy in the theory, design, implementation, prototype, analysis, evaluation, testing, verification, or empirical results of secure systems. Authors of CSP workshop 2015 are promoted to freely enjoy CyberC 2015 and Big Data Summit. Both of the events are co-sponsored by a number of industry giants.