Reply To: Happy Holidays from Hawaii (the H³ challenge)

[f6exb_the_frenchy]

Another way to find the key:
Once we know the period, we divide the text into slices corresponding to the letters of the keyword.
Then we test each slice by decoding it according to Caesar using the “brute force” method.
The line giving letters contained only in the Hawaiian alphabet gives the key letter corresponding to the slice number.
Once the key word has been obtained, all that remains is to decode the Vigenère.