Adding Information to Signature

• for example: timestamp
• the reference means that the timestamp is also signed!

<Signature Id="MySignature" ...>

  <SignedInfo> 

    <Reference URI="something">...</Reference>

    <Reference URI="#MyTimeStamp" 

       Type="http://www.w3.org/2000/09/xmldsig#SignatureProperties">

    ...

    </Reference> 

  </SignedInfo>

  ...  

  <Object> 

    <SignatureProperties>

     <SignatureProperty Id="MyTimeStamp" Target="#MySignature">

       <t:timestamp xmlns:t="http://www.ietf.org/rfcXXXX.txt">

         <t:date>19990908</t:date> 

         <t:time>14:34:34:34</t:time>

       </t:timestamp>

     </SignatureProperty>

   </SignatureProperties>

  </Object>

</Signature>