Directions: Type or paste in ciphertext and crib. If keysquare is 6x6, check 6x6 box. Click Crib Drag button.
Ciphertext:
crib:
Minimum Period:
Maximum Period:
Include crib string
6x6
Output:
Note on repeats: repeats with known key values are repeats in the plaintext; otherwise, repeats are repeats in the ciphertext at the same index position.