Saturday, September 12, 2015

2.3, Due on September 14th

1. I understand the first method of decryption but I don't understand their explanation of why it works.  For finding the key length, why would the number of coincidences tell us that the number of displacements is also the number of digits in the key?  Similarly, once we find how many digits are in the key, why do we count by that? (i.e. 1, 6, 11, etc.)  I do not even understand the second method of decryption and how to calculate it, but I will read that section again before class.

2.  I just think it is so amazing to see the correlation between cryptography and linear algebra.  I never imagined that I would be using the dot product to decrypt a message.  I also think it is pretty amazing that the decryption solutions have been found for all of these encryptions.

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