Today class started where we left off yesterday. The challenge that Jon left the class with yesterday was how many different ways three circles can be tangent. Many of the students got them all except the one that has all the points of all three circles being tangent. Jon then went on to have the students decode a message that he wrote on the board. The students then went to a website that would allow them to put in messages and get it coded. Jon then told the students how to figure out a code using a coordinate plane. The students then began to explore using Caesar Cipher to find shortcuts to figuring out codes.

After break, Jon came back and talked about encryption of data. The first thing he talked about was why it was important. Jon then told the students that encryption is based primarily on prime numbers. The class then began to talk about how slow computers really are at encoding and decoding.