Re: Time-stamp server. Extra field for MessageImpring

[Peter Sylvester <Peter.Sylvester@xxxxxxxxxx>]

I would prefer not to have such a field messageInfo inside the MessageImprint but rather 
elsewhere. Given this, it could also be used in DCS inside either

ReqData ::= SEQUENCE  {
     reqInfo                ReqInfo,
     data                   Data
     messageInfo OCTET STRING OPTIONAL
}

and 
Info ::= SEQUENCE  {
     reqInfo                ReqInfo,
     messageImprint       MessageImprint,
     messageInfo          [0] OCTET STRING OPTIONAL
     reqSignature         [1]    SignerInfo OPTIONAL,
...

}
or simply as an optional field inside ReqInfo.

Peter Sylvester
EdelWeb SA
Paris France


> We'd like to propose adding an extra field to the messageImprint structure:
> 
> Currently, there is no easy way to link the message hash included in the time-stamp-request to the original message. 
> However, most systems will have an [obvious] requirement to associate a time stamp with the original message. Most 
> simply, this could be done by incorporating the original message's filename (or some other internal reference 
> information) into the time stamp. 
> 
> This could be done by adding a messageInfo field to the MessageImprint:
>  
> MessageImprint ::= SEQUENCE  {
>      hashAlgorithm                AlgorithmIdentifier,
>      hashedMessage             [0]	IMPLICIT 	OCTET STRING,
>      messageInfo                   [1] 	IMPLICIT 	OCTET STRING 	OPTIONAL
>           -- a user-defined tag for a pointer to the original message.
> }
> 
> 
>