hi,

see cyber security deals with are of making the pcs and windows or any other computer application to secure from cyber crime, due to the increase of online marketing and lots of data interpreting cyber security is one of the valuable technology in todays era, you may do bca then you may opt for cyber security course, very few colleges offer bca with specialization, so you can learn about cyber security or digital forensics from coaching center or online learning.

however digital forensics is related with forensic science where encompassing the recovery and investigation of material found in digital devices has relation with computer crime. however for bca students you may find more similarity of learning in cyber security then digital forensics.