Writing Encrypted XML to a File

Hi,

I have to create an encrypted string using DSA and attach the resulting
encrypted string as an element in an XML document and output the XML doc
to a file.

The resulting encrypted string has some "special characters" and when I
try to parse the XML file I get the following exception ....

org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x2) was
found ....

Iam using xerces, xalan java apis for XML processing !

How do I encode the encrypted string so that I can create a valid XML file
to be parsed back sucessfully ?

Thanks,
-Senthil