Implicit Mobile-Device Authentication
We introduced autonomous way of authentication using various sensor information to make mobile authentication more secure and usable.

Data Security Issues in Cloud
We are studying data security issues in cloud computing such as auditing for data integrity and data privacy protection.

Efficient Broadcast Algorithm
We introduced an efficient multihop broadcast protocol for wireless sensor networks to minimize redundant transmissions of the same packets and collisions. （published in IEEE Transactions  on Wireless Communications April, 2013）.