Hello Seema,
Yes, you can pursue cyber security in your Masters.As you are from computer background in graduation level, it will help you in your higher studies.Prestigious Institute like National Institute of Technology, Kurukshetra offers M.Tech in cyber security.Also Indian Institute of Technology, Jodhpur offers M.tech degree in Cyber security.
I hope this is helpful to you.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile