2.1-2.2 & 2.4

• I found that the digrams were the hardest to understand for me. It was hard to see how the book deciphered the code in section 2.4. I think the hardest part was figuring out what they were looking for (the frequencies of each letter in the document).
• I thought the affine ciphers were the most interesting. It was interesting to see how dividing by alpha when gcd(alpha,26) not equal to 1, messed up the cipher completely.