Current research interests include security and privacy for IoT, security, privacy and trust within mobile communication systems and threats and risks at system level (critical ICT infrastructures).
Køien has served on the 3GPP technical standardization group SA3 (Security) for more than 10 years, while at Telenor R&D, as program committee member and reviewer for many international conferences and journals.
He was a guest co-editor for special issues of the Journal of Cyber Security and Mobility, and Teletronikk.
He has previously worked for Ericsson Norway, System Sikkerhet AS and Telenor R&D.
He has also held an adjunct senior advisor position at Norwegian Communications Authority.