X509Certificate2 certificate = new X509Certificate2(Settings.Default.PublicKey);

            try
            {
                byte[] encryptedData;

                using (var rsa = (RSACryptoServiceProvider)certificate.PublicKey.Key)
                {
                    encryptedData = rsa.Encrypt(aes.Key, false);
                }
                return Convert.ToBase64String(encryptedData);
            }