[Ndn-interest] Repo-ng freshness period

[Junxiao Shi]

Hi Matteo

Since I generate the certificates with ndnsec, is there a method to obtain
> that?
>
You'll have to patch ndnsec cert-gen to add FreshnessPeriod before the
certificate is signed.
https://github.com/named-data/ndn-cxx/blob/2fa5939375d39eb63239148aca4af6
a92f45637d/tools/ndnsec/cert-gen.hpp#L217


The one of the certificate was only an example, but at the end how can I
> avoid that intermediate content store consider the data  published by
> repo-ng fresh indefinitely?
>
Current protocol does not have a mechanism for that. Consumers are expected
to use a name discovery mechanism to determine whether the Data is latest.
But I wonder what's the motivation for this?

Yours, Junxiao
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