1. I had some difficulty understand the process of encrypting and decrypting the playfair cipher. It seemed like it was suppose to be put in a matrix but the author didn't chose not to for an explanation. The fraction inverse of (mod n) is still a foreign idea to wrap my brain around.
2. I thought the block ciphers and the use of matrices in cryptography interesting. It seems like linear algebra is used every where in all sorts of places in mathematics, yet there is only one undergraduate course offered. Maybe there should be more linear algebra courses.
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