Maths Spl

Hi,
Don't get too fascinated with "ethical hacker" as they show in movies. Hackers mean "thieves". No company would hire a thief to steal other company's data as that could land them in serious legal trouble. Further, hacking requires a deep knowledge of computer programming and the functioning of computer and networks.
What I would rather recommend you is go for security specialist professionals. These jobs are highly payable and in high demand as most companies need them to protect their own data.
For the same, you can go to some reputed computer training institutes like NIIT, etc. You can go for Java courses (all modules) followed by networking and CCNA/CCNB (CISCO) courses.
Pursue the course alongside any computer related degree course (BCA etc.) for better outcome.

Hello Govind,
Yes, you can. Most universities require you to have physics as your extra-departmental/pass course for you to study physics in M.Sc. However, since science departments offer admission to Master's degree students via entrance exams, this might be difficult anyway. You'll have to work hard in physics to crack entrance exams. Alternatively, you could apply for an applied mathematics degree in Calcutta University or CMI or even for M.Sc in mathematics. Most of the departments have someone or the other working in the mathematical physics. Courses that are relevant to that are differential geometry, probability theory/functional analysis, representation theory/Lie groups and of course, the theory of differential equations.
Approaching physics via mathematics is reasonably common.