Cloud Computing

Cloud computing is an internet-based computing that provides shared computer processing resources and data to computers and other devices on demand. It is a model for enabling ubiquitous, on-demand access to a shared pool of configurable computing resources (e.g., computer networks, servers, storage, applications and services), which can be rapidly provisioned and released with minimal management effort. It is in demand, if you are planning to take IT infrastructure management as a career.

You can be a cloud analyst, cloud architect, mobile application developer, cyber forensic analyst, etc.

Both of the subjects are not a specialisation at BCA level.BCA is a graduation and it cannot have such a micro level specialisation as they are subsets of a bigger part of computing.
Few institutes like CSSRL may give you an additional certification from UK and a BCA degree from IGNOU.
Successful completion of the IGCS program entitles a candidate to receive an International Diploma in IT security accredited with IADL (UK) and Bachelor's degree in Computer Application from Indira Gandhi National University (IGNOU), Delhi.