12.1 12.2 for 16 November

1. I was a little unsure of how the Vandermonde matrix was set up and why it worked exactly.

2. I thought the idea of secret sharing was interesting, that the secret could be split among 7 people but a minimum of 3 people would be needed to uncover it (as an example). The idea of an interpolation polynomial seemed like a creative way to go about it.