Clarification With Pictures
Assume one wants to encrypt the digraph OR. There are three general cases:
| 1)
* * * * *
* O Y R Z
* * * * *
* * * * *
* * * * *
Hence, OR -> YZ |
2)
* * O * *
* * B * *
* * * * *
* * R * *
* * Y * *
Hence, OR -> BY |
3)
Z * * O *
* * * * *
* * * * *
R * * X *
* * * * *
Hence, OR -> ZX |
Read more about this topic: Playfair Cipher
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