B.Sc

You can opt to become an ethical hacker after B.Sc CS if you have excellent computing skills. You may become a certified ethical hacker. A certified ethical hacker is a skilled professional who understands and knows how to look for weaknesses and vulnerabilities in target systems and uses the same knowledge and tools as a malicious hacker, but in a lawful and legitimate manner to assess the security posture of a target systems. The CEH credential certifies individuals in the specific network security discipline of ethical hacking from a vendor-neutral perspective. You may work to get CEH certification.

Eligibility criteria for M.Sc forensic science is as follows:
"B.Sc degree from any recognized university with at least 50% marks in the aggregate. The candidate must have studied for at least 2 years (4 Semester) of 3 years degree course. Any 2 subjects out of (a) physics (b) chemistry (c) biology /zoology/ genetics /bio technology/ physical anthropology".
You are eligible to seek admission in M.Sc forensic science.

It depends solely on your interest and the choice of career you want to have. Both are exciting fields and have their respective pros and cons. You need to analyse your set of skills and interests and then decide what's best for you.

Based on market acceptance and scope, following are my recommendations for you (a) B.Tech CSE/IT (b) BCA-MCA (c) B.Sc-M.Sc CS/ IT. In order to have good job and career, you are recommended to do these degrees from a prestigious college with good campus placement records only.