1) I don't understand how the frequency analysis is usually successful for play fair ciphers because the blocks of two letters are two small. Then for block ciphers, do you just pick a random matrix M to begin with? I also can't remember how to take the determinant of a 3x3 matrix. But I can look that up before class. I am confused on the description of this whole cipher. Binary numbers????
2) The play fair cipher was clever to me. I like to see the creativity in all of the different cipher methods. The story about Sherlock holmes was awesome and refreshing.
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