The Exciting
The Sherlock Holmes story was really interesting and was fun to read. It was fun seeing some matrices reappear, because I have not used them since Math 313 two years ago. My favorite of these methods was the ADFGX method because it had two completely trippy steps to encrypting the messages.
The Difficult
I had a hard time understanding how to crack a code written in ADFGX when the key and matrix aren't known; it mentioned something about having the first several characters match, but I couldn't follow the entire method. Also, on page 35 when they inverted the 3 x 3 matrix, I can't tell how they got that inverse so easily; is there some quick trick that I never learned?
One other question I have is in cracking the Hill cipher; they say they can break it if they have enough plaintext and the ciphertext; are they just using that information to guess what the matrix is?
One other question I have is in cracking the Hill cipher; they say they can break it if they have enough plaintext and the ciphertext; are they just using that information to guess what the matrix is?
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