can paste your own ciphertext into the box below or you can try to crack the the
ciphertext that is already there. The first step in cracking the Vigenère
cipher is to look for sequences of letters that appear more than once in the ciphertext.
The most likely reason for such repetitions is that the same sequence of letters
in the plaintext has been enciphered using the same part of the key. Click the
button labelled 'Find Repeated Sequences' to perform this analysis.The repeated
sequences may take a moment or two to appear.