With millions to billions of connected Internet of Things (IoT) devices and systems sending heterogeneous raw and processed data through the IoT network, we need to be able to effectively utilize big data analytical techniques and solutions and ensure the security and privacy of IoT data and services against the broad range of attackers. Further complicating the challenge is the increasing number of nodes and complexity of the IoT network and ecosystem, for example the increasing number and size of audit and security logs and intrusion data to be collected and analyzed. The purpose of this handbook is to explore cyber security, forensics and threat intelligence challenges and solutions relating to IoT and big data