Digital signature of an Office Word .doc

Hello

I wan't to sign a word doc.
I have two options (or more...):

(1) read the document with the help of"org.apache.poi" sign and then I like.
(2) use the built in features of Word.

Is anyone know what algorithms are used in option 2)?
is 2) crypto wise?
What is the best approach?
are there other approaches?

Thank you.

I do not use Microsoft Office (don't know why someone would when OpenOffice does everything that 98% of the cares of the world all in a word processor, free of charge, on multiple platforms), so I can't speak for how it digitally signs documents internally.

The benefits of working with the Word-specific signature feature is that the document can be stored/retrieved as a regular Word document, and also long the extractor use a compatible version of the word processor, they will be able to verify the signature inside the word; without special tools. As all MS products tend to use the keystore CAPI/CNG in the Windows operating system, all the key-points forts/algorithms available in a Windows version should be available within Word for the signature feature.

However, if you need to send the signed document to anyone on a non-Windows platform, or have the signed document verified on incompatible Word versions, you cannot use the features of signature specific to Word.

What you should use is XMLSignature (http://www.w3.org/TR/xmldsig-core/).

XMLSignature will let you take any document - binary or text - digitally sign and send the XML document from any application or platform where a XMLSignature library is available and post the document. You can do it from the command line, GUI or middle of the jet within a business process. You have not even need to open the document processor to validate his signature; You can validate the XML signature while dealing with the XML stream.

XMLSignature is supported on all major operating systems as open source. It is also a standard component of Windows. It is available in JDK6 as a standard component, and is also the native in OpenOffice signature mechanism - which means that OO-signed documents can be signed on Windows, Linux, OS X, or UNIX and verified on Windows, Linux, OS X, or UNIX right in OpenOffice or using libraries of XMLSignature.

Arshad Noor
StrongAuth, Inc..

Tags: Java

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