One of my uncles is a member of the faculty of the CS department of IIT Kanpur and thus most of the information in this answer is based on what I heard from him. The CS department of IIT Kanpur is one of the oldest and is known for its cutting-edge research work. The following points entail a few areas of research that the CS department of IIT Kanpur excels at.
Cyber-security and Cryptosystems
Theoretical Computer Science
Data Science
Other areas of research in CS at IIT Kanpur include programming language and analysis computer architecture, mobile networks, biometrics and software architecture. Most of these projects and research work are led by individual professors.