1. The most difficult part of this chapter was understanding why the method for finding the key length works. The explanation was a little unclear at first. However after reading it the section on how to find the key was easy to understand.
2. This cipher seemed more complex than the previous ciphers and it is fun to be able to crack a cipher that is more complex than just a substitution cipher. I also wonder how you might crack a modified Vigniere cipher if you were to change each letter with an affine cipher rather than just a substitution cipher.
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