Grammarians may argue, but the Associated Press (@APStylebook), which for all intents and purposes still holds the throne when it comes to news copy style, says it is one word – Cybersecurity: Cybersecurity vs. Cyber Security: When, Why and How to Use the Term #grammar http://infosecisland.com/blogview/23287-Cybersecurity-vs-Cyber-Security-When-Why-and-How-to-Use-the-Term.html