2.3, due September 10

I like the Vigenere cipher more than the other "primitive" methods of encryption that we've talked about thus far.  It seems to be a little more robust, since it requires both frequency analysis, as well as some vector algebra to be broken.  The fact that one has to determine the key length as well as the shifts of each character in the key seems to add a little bit more to the strength of the method, though I'm sure it could be broken easily by a computer nowadays.  The second method of finding the key is a little hard to follow at first, but the summary at the end of the section made it much easier to understand.