Digital signature of an Office Word .doc

Hi,
I wan't to sign a word doc.
I have two options (maybe more...):
1) Read the doc. using "org.apache.poi." and then sign it as I like.
2) Use the built in features of Word.
*** Does anyone know what algorithms are used in option 2)?
is 2) strong crypto wise?
what is the better approach?
are there other approaches?
THANKS.

800414 wrote:
I'm looking for examples and\or direct specifications that it works with word .doc.You are not likely to see a specification from anyone that digital signatures work with specific types of documents - unless it happens to be an industry-specific use-case (an example is the eNotarization Markup Language - http://lists.oasis-open.org/archives/tc-announce/200903/msg00004.html).
XMLSignature (DSIG) can sign anything. Assuming you're signing reasonable-sized documents (that can fit into main-meory without crashing the computer), you can Envelope the document with the signature in one of three ways:
1) If the To-Be-Signed (TBS) document is an XML document, just Reference the TBS-document's root element for the signature;
2) If the TBS document is ASCII text, you can wrap it with your own element name and Reference the newly-made-up element for the signature;
3) If the TBS document is binary, Base64-encode the binary, wrap it with your own element name and Reference the newly-made-up element for the signature. Don't forget to Base64-decode the element content to recreate the binary file.
You really need to experiment with DSIG a little bit to understand the ways in which it can work for you. Don't try to understand the entire DSIG specification before you use it - it is too hard unless you have a very good understanding of cryptography and XML Schema Definition (XSD). Do the tutorials that Sean Mullan created (http://java.sun.com/developer/technicalArticles/xml/dig_signature_api/ and http://download.oracle.com/javase/6/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html); go back and read the DSIG spec, review the examples again and the light will start getting brighter.
I cannot stress how important it is to have a grasp of XML Schema Definition to understand anything in XML anymore. To be honest, I would begin there because anything you do in XML will touch XSD. When things go wrong with XML validation of schema-constrained documents (as DSIG is), all your error-messages are likely to reference the document's XSD. If you don't understand how XSD works, you will definitely start drinking - or drinking more. :-)
Arshad Noor
StrongAuth, Inc.

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