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Topic: FDF Security and Usablity Concerns...Please Help
Conf: (P-PDF) Developers, Msg: 103245
Date: 1/6/2004 02:41 AM
I am using the FDF toolkit to populate online pdf forms that contain very sensitive data. The forms are available on a government Intranet. I have users on Acrobat 5.0 (Reader and Full) and 6.0 (Reader and Professional). Our fdf documents are loaded through a "#FDF=mypath.fdf" extension to a pdf url.
The problem I am having is that cached FDF's keep reloading with subsequent calls to the pdf. My average user may reload the same pdf form with different fdf data 30 or 40 times a day. Yes, the cached data can be cleared with a Reset(). But there are problems with this workaround. And these problems get worse the more a user reloads a form with new fdf data.
For one, the initial appearance of all this cached data, even if then wiped out with a reload, is a security concern. If the browser or Reader plugin freezes at this point sensitive data would exposed.
What to do? I have tried deselecting the Keep Forms Data Temporarily Available on Disk checkbox in Acrobat 6.0. As far as I can tell, deselecting this option does not prohibit cached fdfs from reloading. I have the same problems with this checkbox deselected.
My current workaround is to pass a random variable in the pdf url, such as: x=174687. This seems to fool the pdf into thinking this is a new document and ignoring cached data. But, in doing so, I am forced to reload the pdf every time as well, hence losing the benefit of separating form from content in terms of download times.
Has anyone figured out a better solution? Thanks in advance for any responses