/// <summary>
/// Constructs an object able to encrypt & decrypt messages using playfair cipher. Please note
/// that this implementaton only uses English alphabet and letter 'Q' is being omitted from the
/// cipher key table. Numbers and special characters are ignored.
/// </summary>
/// <param name="digrathGenerator">Digrath generator.</param>
/// <param name="playfairKeyManagement">Playfair key management.</param>
public PlayfairCipher(IDigrathGenerator digrathGenerator, IPlayfairKeyManagement playfairKeyManagement)
{
_digrathGenerator = digrathGenerator;
_keyManagement = playfairKeyManagement;
}
