<Dl> <Dd> C i = E K (M i) = (M i + K i) mod 26 (\ displaystyle C_ (i) = E_ (K) (M_ (i)) = (M_ (i) + K_ (i)) \ mod (26)) </Dd> </Dl> <Dd> C i = E K (M i) = (M i + K i) mod 26 (\ displaystyle C_ (i) = E_ (K) (M_ (i)) = (M_ (i) + K_ (i)) \ mod (26)) </Dd> <P> and decryption D (\ displaystyle D) using the key K (\ displaystyle K) as </P> <Dl> <Dd> M i = D K (C i) = (C i − K i) mod 26 (\ displaystyle M_ (i) = D_ (K) (C_ (i)) = (C_ (i) - K_ (i)) \ mod (26)), </Dd> </Dl>

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