Sunil Kumar,
An Ethical Hacker is a pc and network resource person who penetrates a security system with the company's permission.
There is a huge demand for Ethical Hackers in India and companies like IBM, INFOSYS, WIPRO are intrested in hiring Ethical Hackers. It maybe a very niche IT security skill with very limited career opportunities. But if you are able get break in this career it can be high paying and very satisfying and challenging profession.
Relating to Ethical H acking there is no graduation degree . However, you'll be able to pursue moral hacking certificate course together with your graduation in (B.Sc. Computer Science or B.Tech. in Computer Science/BCA) .You can pursue varied Certification Courses in moral Hacking to become an authorized moral Hacker (CEH).
Here's a list of best Colleges/Institutes from where you'll be able to pursue Ethical Hacking-
Apart from this, there are many best courses in diploma & degree.
Given below are few best courses in both diploma & degree-
Top Institutes in INDIA:
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