2.5-2.8

One thing that I thought was somewhat vague was how to decrypt the ADFGX cipher. It left it up in the air how to deterministically figure out the boundaries for each column in the example listed in the book since one column has one more letter than the rest. I thought the matrix based block cipher was really interesting since it can be expanded to multiple letters easily and has many possibilities, but it also fails so easily once one plaintext is discovered.