> I'm just getting my feet wet with xml-sec so bear with me. > > Are you trying to avoid having the <file> element copied in three > signatures? Or having it transfered back to the central repository? > Or are you looking for a group signature. (Saw a presentation at RSA > 2004 by Dan Boneh http://robotics.stanford.edu/~xb/crypto04a/ that > talked about this, but it might not be what you need). > > Noah
Basically I want to avoid copying the file element all around. When the file element is small, it's not much of an issue, but some signed audio transcript files, for example, run into the 10-50MB range -- when a doctor is signing off on their dictation notes. So each time a signature is applied, I'd like to be able to transmit that signature element by itself so that the receiver can simply append it to their information without needing to send the original data again. David
