IFX Mail Archive: RE: IFX> Sender URI Stamp

IFX Mail Archive: RE: IFX> Sender URI Stamp

RE: IFX> Sender URI Stamp

From: Gail Songer (gsonger@peerless.com)
Date: Mon Feb 03 2003 - 16:13:42 EST

  • Next message: Rick Seeler: "RE: IFX> Sender URI Stamp"



    On a fax document, the date/time and ID of the sending machine are part
    of the transmitted image; added to the image by the sender.


    In keeping with current fax, I would think that we still want this
    information as part of the image. So I guess I think that answer is "no,
    the information in the dictionary is not quite enough". If the doc is
    printed and the soft copy discarded then this information is lost.


    The digital signature does validate the data from the originating
    sender, but what if the receiving user decides to try to re-fax what he
    just got? Do we replace the signature and the URI stamp?





    -----Original Message-----
    From: Rick Seeler [mailto:rseeler@adobe.com]
    Sent: Monday, February 03, 2003 12:50 PM
    To: Gail Songer
    Cc: ifx@pwg.org
    Subject: RE: IFX> Sender URI Stamp




    A digital Signature gives you a tamper-proof way to time-stamp a
    document, but besides that...


    What about using the information in the "Document Information
    Dictionary" (See Table 9.2 in the PDF Reference 1.4)? This dictionary
    is already part of the PDF/is spec. and should be all that is needed.
    Of course, it's not tamper proof unless the document is also digitally


    Is this what you were looking for?




    -----Original Message-----
    From: owner-ifx@pwg.org [mailto:owner-ifx@pwg.org] On Behalf Of Gail
    Sent: Monday, February 03, 2003 12:11 PM
    To: ifx@pwg.org
    Subject: IFX> Sender URI Stamp



    It's occurred to me that with PDF we have level of portability that we
    didn't have before. However the IFX spec requires that the sender add
    the URI of the sender:


    The Sender MUST place the Sender's URI, i.e., the value of the

    "sender-uri" attribute (see section 8.3), along with the date

    and time, in one of the following places, DEPENDING ON


    1. On a cover page automatically generated by the Sender that is sent
    before the rest of the document.

    2. Merged with the first page of the document.

    3. At the top of every page of the sent Document.

    The Sender MAY include additional data (Sending User, Receiver

    identity, etc.). As for regular FAX, it is RECOMMENDED that

    this information be represented as bit map data, so that it is

    more difficult for it to be modified before it gets to the




    My first thought was to add an optional field to the PDF that indicated
    where the Stamp was located. If the doc was resent, then the second
    sender could replace the Stamp with its own stamp. But if the doc was
    digitally signed then either the Signature would be lost or invalidated.


    Anything thoughts on how we should handle this?



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