Introducing Multiplication in MPC

Key Learnings
- It is possible to multiply two numbers, without ever learning what they are
- The helper parties do not even learn the answer, as they compute a secret-sharing of the answer
- Each helper just needs to do some simple addition and multiplication
- There is a step called "Masking" which involves generating random numbers
- At the end, each helper writes a number down and shares it with the helper to their right side.

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