java - How to Timestamp signature create? -

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i want use timestamp signature xml, pdf. have read document timestamp, don't understand how create or add timestamp signature on client. (i don't talk how create timestamp on server).

i want know how create timestamp signature on client: client receives timestamp tsa server, client attaches timestamp data. client signs data+timestamp create timestamp signature or client signs data => creates signature receive timestamp , attach timestamp signature => create timestamp signature.

what's correct way create timestamp signature in 2 ways? can me answer , what's way product using? can give me document issuer?

both orders of making time stamp , signature can make sense

  • signature content time stamp: first time stamp document, add time stamp attributes sign, , sign document , attributes.

    using construct can prove that

    • the document existed in given form @ time of time stamp and
    • the signature has not been created before time of time stamp.

  • signature signature time stamp: first sign document, time stamp actual signature value, , add time stamp unsigned attributes of signature.

    using construct can prove that

    • the document existed in given form before time of time stamp (indirectly) and
    • the signature has not been created after time of time stamp.

which of these options use, depends on want able prove later. second option, signature signature time stamp, used more often.

actually combined construct, signature both content time stamp , signature time stamp, makes sense. in particular allows prove signature has been created between time of content time stamp , time of signature time stamp. if these entities have been created in short order, can pinpoint provable signing time precisely.


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