Aims: Provides an in-depth and holistic view of security and solutions from practical to theoretical aspects.Covering topics that are equally valuable for practitioners as well as those new in the field. Scope: This journal covers security issues in cyber space and solutions thereof. As cyber space has moved towards the wireless/mobile world, issues in wireless/mobile communications will also be published. The publication will take a holistic view. Some example topics are: security in mobile networks, security and mobility optimization, cyber security, cloud security, Internet of Things (IoT) and machine-to-machine technologies.