Problem Teachers' Notes Hint Solution

Congratulations if you can read this, this encryption's getting quite complicated. The vigenere method of encryption commutes with a transposition if its row and column lengths are one more than a multiple of the keyword length, so in this case with a keyword of length two we need them to both be odd. I hope you've enjoyed decrypting these messages, why not try coming up with some ciphers yourself and testing your friends.