The Playfair cipher uses a digraph substitution encryption scheme with the a symmetric block key. It's pretty easy to break with a computer and sufficient ciphertext. However, for short messages between people, it can be hand coded quickly and is relatively secure as long as the key is hidden. It's also an easy way to start studying the more robust cryptographic methods.
ub yv fn jg ly nd bm of ds op eg ok cm lo ji jm oy cl ms na
- The keyword is Playfair
- A decryption /encryption script is here. ( you'll have to cut and paste )
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