Background topics required to get into Cryptography

I recommend you to read background subjects such as:

1. Statistics
2. Probability
3. Number Theory
4. Linear Algebra
5. Information Theory
6. Theory of Automata & Topics in Complexity theory
7. Coding Theory
8. Abstract Algebra
9. Data Structures & Algorithms
10. Any programming Language

These will help you to master cryptography as a whole. You choose your MS course so that you can learn these subjects as part of it. After that entering into cryptography will be cakewalk. Otherwise you cannot do good research work in Cryptography.

Any more inputs, please write me to malapati@Google's mail dot com