Subject: TimeStamp request

From: Carmen Garcia <[email-masked]>
Date: Wed, 25 Nov 98 02:54:00 -0500

Hi all,

We are involved in a time stamp project. 
We need to send a request for a timestamp to the Time Stamping Authority including in the request itself alternatively the hash value of the data or the entire document.
Further we could ask for more than one timestamp, thus we need to put, in the same request, the number of required timestamps that the TSA should give back.

At this point we have two questions to propose you for discussion.

1. In the time stamping request described into the draft "Internet X.509 Public Key Infrastructure Time Stamp Protocols" (at http://www.ietf.org/internet-drafts/draft-ietf-pkix-time-stamp-00.txt )….

TimeStampReq ::= SEQUENCE  {
     version                      Integer  { v1(0) },
     reqPolicy                    PolicyInformation OPTIONAL,
     tdas                         SEQUENCE OF GeneralName OPTIONAL,
     nonce                        Integer,
     messageImprint               MessageImprint OPTIONAL 
       --a hash algorithm OID and the hash value of the data to be
       --time stamped
}

….there is no reference to the possibility to send the ENTIRE DOCUMENT to be timestamped, instead of  the hash of the message. If we want to have the possibility to send the whole document into the request, how can be done? Can we include into the request another optional field in order to send the whole document? What kind of interoperability implications with others implementations could occur? Is this one the right way or are there other solutions?

2. As above, there is no a specific field to hold the NUMBER OF REQUESTED TIMESTAMPS. Can we work in the same way? 

Obviously the second point influences the format of the response described in the draft if we want
to receive in a unique response all the required timestamps.

Regards,

Carmen Garcia.

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Carmen Garcia
Software Engineer
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