India, with unique features of big geographical area, varied culture and linguistic diversity is a developing nation. For a country with large population and scarce resources like India, computer technology comes as a great tool of social transformation. Today it is recognized as an effective tool for catalyzing the economic activity in efficient governance and in developing human resource. The government of India has introduced and taken steps to make India as digital India. It is a vision to transform India into a digitally empowered society and knowledge economy. It is a step ahead to strive towards excellence in all spheres and to strive nation constantly rises to higher level and to make compatible with other members of the world community. In spite of the merits of Digital India it is inevitable that there are some challenges which might be proved great hurdles in the successful working of the system. In this perspective, cyber security becomes boon to curb and control obstacles in the functioning of Digital technology. In the present paper researcher aims to focus on the cyber security which will ensure the working of digital technology and also attempts to give suggestion on the application of cyber security with special reference to Mobile Banking, a key programme for cashless economy to empower Digital India.