Hexadecimal Characters in Encoded XML Atribiute

[VakitaNal]

I'm using following method to encrypt the data before storing them into database. The data will be converted to XML upon retrieval and passed to data-access layer to be deserialized into a known business entity object. The problem is there are some Hexadecimal characters in data due to encoding and that makes the xml an invalid xml document so it can't be deserialized. How should I solve this problem?\[code\]public static string EncryptStringAES(string plainText, string sharedSecret) { if (string.IsNullOrEmpty(plainText)) throw new ArgumentNullException("plainText"); if (string.IsNullOrEmpty(sharedSecret)) throw new ArgumentNullException("sharedSecret"); string outStr = null; // Encrypted string to return RijndaelManaged aesAlg = null; // RijndaelManaged object used to encrypt the data. try { // generate the key from the shared secret and the salt Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt); // Create a RijndaelManaged object aesAlg = new RijndaelManaged(); aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8); // Create a decryptor to perform the stream transform. ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV); // Create the streams used for encryption. using (MemoryStream msEncrypt = new MemoryStream()) { // prepend the IV msEncrypt.Write(BitConverter.GetBytes(aesAlg.IV.Length), 0, sizeof(int)); msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length); using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) { using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)) { //Write all data to the stream. swEncrypt.Write(plainText); } } outStr = Convert.ToBase64String(msEncrypt.ToArray()); } } finally { // Clear the RijndaelManaged object. if (aesAlg != null) aesAlg.Clear(); } // Return the encrypted bytes from the memory stream. return outStr; }\[/code\]