Как зашифровать данные с помощью открытого ключа 4096 в C#

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Что я уже пробовал:

public string EncryptByPublicKey(string data, string publicKey)
       {
           IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine());
           try
           {
               RsaKeyParameters key = (RsaKeyParameters)GetPublicKeyParameter(publicKey);

               engine.Init(true, key);

               byte[] byteData = Encoding_UTF8.GetBytes(data);

               int maxBlock = key.Modulus.BitLength / 8 - 11;

               List<byte> resultData = new List<byte>();

               int offSet = 0;

               for (int i = 0; byteData.Length > offSet; i++)
               {

                   byte[] tmpByte = new byte[] { };

                   if (byteData.Length - offSet > maxBlock)
                   {
                       tmpByte = engine.ProcessBlock(byteData, offSet, maxBlock);
                   }
                   else
                   {
                       tmpByte = engine.ProcessBlock(byteData, offSet, byteData.Length - offSet);

                   }
                   offSet = maxBlock * (i + 1);
                   resultData.AddRange(tmpByte);
               }
               //for (int chunkPosition = 0;chunkPosition < byteData.Length; chunkPosition += maxBlock)
               //{
               //    int chunkSize = Math.Min(maxBlock, byteData.Length - chunkPosition);
               //    resultData.AddRange(engine.ProcessBlock(
               //        byteData, chunkPosition, chunkSize
               //    ));
               //}

               string cipherText = Convert.ToBase64String(
                   Encoding.UTF8.GetBytes(
                       Convert.ToBase64String(resultData.ToArray())));

               return cipherText;
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

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