His primary research interests are blockchain technology, cyber security and artificial intelligence in security including intrusion detection, blockchain applications, smartphone security, biometric authentication, HCI security, cloud security, trust management, malware detection, cyber-physical system security and IoT security. He also shows a strong interest in applied cryptography. He serves an editor role for IEEE Transactions on Dependable and Secure Computing, Journal of Information Security and Applications, and International Journal of Information Security, etc., and was General Chair / Program chair for many reputed conferences such as IEEE Globecom (CISS) 2020, IFIPSEC 2022, ESORICS 2022, ACM CCS 2023, etc. He was the Chair of IEEE Young Professionals Affinity Group - Denmark Section. He is an ACM Distinguished Speaker, IEEE Computer Society Distinguished Visitor, a senior member of IEEE, a senior member of ACM, a senior member of CCF, an EAI Fellow, and an IARIA Fellow.