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RE: [ers-02.txt] Questions
Aleksej,
Well, it's more clear to me now...
ERS just proposes a syntax for EV that can be used by CSM to kepp electronic signature valid.
But according to RFC-3126, ES-A is a format that reech the same target than ERS in CMS.
So my question is, if i want to archive signature, i have the choice between RFC3126 ES-A or ERS in CMS. Am I right ?
If I am, will ES-A be obsoleted by ERS in CSM (as shown in Appendix A in [ers-02]) ?
But be sure that I understand ERS is more than just a way to maintain a singature valid.
Regards,
Loïc
> -----Message d'origine-----
> De : A. Jerman Blazic [mailto:aljosa@xxxxxxxxx]
> Envoyé : vendredi 29 avril 2005 11:48
> À : HOUSSIER Loic RD-MAPS-ISS; ietf-ltans@xxxxxxx
> Objet : RE: [ers-02.txt] Questions
>
> Loic
>
> This is what I didn't state. You have to distinguish the
> level of the two
> approaches. ERS deals mainly with providing syntax on (time)
> evidence and
> evidence on integrity of a data, while RFC3126 provides data
> strucutre for
> long term validity of a digital signatures. In this case RFC
> can rely on ERS
> for time and integrity evidence of a signature, so it is a
> more low level
> syntax. Or in other words, if you equip CMS with accredited
> time, you can
> ged basic ERS structure (of course ERS is more than that:
> e.g. grouping and
> hash trees). This is why I said the approaches of LTANS vs. XAdES are
> somehow different, while addressing similar problems.
>
> BR
>
> Aleksej
>
> > -----Original Message-----
> > From: HOUSSIER Loic RD-MAPS-ISS
> > [mailto:loic.houssier@xxxxxxxxxxxxxxxxx]
> > Sent: 29. april 2005 11:24
> > To: A. Jerman Blazic; ietf-ltans@xxxxxxx
> > Subject: RE: [ers-02.txt] Questions
> >
> > Aleksej,
> > Thanks for your reply.
> >
> > So, to demonstrate the existantce and stability of signature
> > on particular, there will be two ways in PKIX community:
> > One using rfc3126, one with ERS attribute within a CMS
> > signature object. Am I wrong ?
> >
> > Loïc
> >
> >
> >
> > > -----Message d'origine-----
> > > De : A. Jerman Blazic [mailto:aljosa@xxxxxxxxx] Envoyé :
> > vendredi 29
> > > avril 2005 11:08 À : HOUSSIER Loic RD-MAPS-ISS;
> ietf-ltans@xxxxxxx
> > > Objet : RE: [ers-02.txt] Questions
> > >
> > > Dear Loic
> > >
> > > I would be very careful here. XAdES for example is like the
> > name says:
> > > syntax for extended signature, which builds on top of a
> > signature and
> > > includes all needed complementary data to provide long term
> > stability
> > > of digital signatures. The LTANS position, as I understand it,
> > > distances from such approach and deals with long term
> stability of
> > > data. ERS in this case defines requirements on how to
> > demonstrate the
> > > existence and stability of data (not signature on
> particular) on a
> > > timeline. It does not define the data structure nor the
> > syntax and at
> > > the moment you can freely use any interpretation of an
> > evidence record
> > > including CMS. But XAdES? I am not so sure....
> > >
> > > Best regards
> > >
> > > Aleksej
> > >
> > > > -----Original Message-----
> > > > From: owner-ietf-ltans@xxxxxxxxxxxx
> > > > [mailto:owner-ietf-ltans@xxxxxxxxxxxx] On Behalf Of
> HOUSSIER Loic
> > > > RD-MAPS-ISS
> > > > Sent: 29. april 2005 10:46
> > > > To: ietf-ltans@xxxxxxx
> > > > Subject: [ers-02.txt] Questions
> > > >
> > > >
> > > > Hi all,
> > > >
> > > > Reading ERS_02, I have question :
> > > > It s said that ER can be part of the Archive or can be
> stored as
> > > > another file. What I understand is that we can (using CMS
> > or XADES)
> > > > do ER as part of the Archive.
> > > > But Is it compliant with ERS ?
> > > >
> > > > Thanks
> > > >
> > > > Loïc
> > > >
> > > >
> > > >
> > > > > -----Message d'origine-----
> > > > > De : owner-ietf-ltans@xxxxxxxxxxxx
> > > > > [mailto:owner-ietf-ltans@xxxxxxxxxxxx] De la part de
> > > > > Internet-Drafts@xxxxxxxx Envoyé : vendredi 8 avril 2005
> > 21:29 À :
> > > > > i-d-announce@xxxxxxxx Cc : ietf-ltans@xxxxxxx Objet : I-D
> > > > > ACTION:draft-ietf-ltans-ers-02.txt
> > > > >
> > > > > A New Internet-Draft is available from the on-line
> > > Internet-Drafts
> > > > > directories.
> > > > > This draft is a work item of the Long-Term Archive and
> > > > Notary Services
> > > > > Working Group of the IETF.
> > > > >
> > > > > Title : Evidence Record Syntax (ERS)
> > > > > Author(s) : R. Brandner, et al.
> > > > > Filename : draft-ietf-ltans-ers-02.txt
> > > > > Pages : 25
> > > > > Date : 2005-4-8
> > > > >
> > > > > In many scenarios, users need to be able to ensure and
> > prove the
> > > > > existence and integrity of data, especially digitally
> > > > signed data,
> > > > > in
> > > > > a common and reproducible way over a long and possibly
> > > > undetermined
> > > > > period of time. This document specifies the syntax and
> > > > processing
> > > > > of
> > > > > an Evidence Record, designed for long-term
> > non-repudiation of
> > > > > existence of data, which particularly can be used for
> > > > conservation
> > > > > of
> > > > > evidence of digitally signed data.
> > > > >
> > > > > A URL for this Internet-Draft is:
> > > > >
> http://www.ietf.org/internet-drafts/draft-ietf-ltans-ers-02.txt
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