title: RSA signature on web applications, general directions needed
body: <p>im 100% new to digital signature, as far as i understand, a document is signed by an user private key, and that signature is checked using the public key. my problem is that i have a web application, and a file server... Files are created on an earlier stage. then an user that is using the application checks the files and signs them using his key. </p>
  
  <p>those files are stored on a file server and they need to be strip from some of the content in order to do the signature (according to the implementation manual of the file, an HL7 CDA file). so, i need some direction to understand how to do this, should i retrieve the file, then alter it and sign it from the browser, or should i send the private key to the server and make all things there?</p>
  
  <p>or any other option, mks.</p>