Is the belief then that they are added, but then never maintained, and
therefore browsers should intervene and prevent their addition

How is that different from some industry sector requiring a piece of
third-party software that is never updated?

That is, as Martin said, it seems that the concern you’re raising is one of
a lack of update/maintenance. The clarification suggests it’s not a lack of
browser/OS maintenance, but maintenance by the local user/organization
administrator.

However, at that point, what makes 25 years better than 100 years? Both
seem unacceptably long? What is the frequency at which an organization
should review any roots it has added, if software was going to be
prescriptive about local configuration? It would seem to be on the order of
months, not years.

On Tue, Oct 12, 2021 at 4:55 AM Peter Gutmann <[email protected]>
wrote:

> Martin Thomson <[email protected]> writes:
>
> >Can you say more about this?  Are you concerned that people are not
> getting
> >updates to their trust anchors?
>
> These are CAs (or more accurately TAs) added directly to the trust store by
> private organisations serving, for example, a particular sector of
> industry,
> they're not audited by anyone.  So the TA will be active forever, or at
> least
> for one to two hundred years depending on what the certificate says unless
> the
> browsers actually enforce an upper limit.
>
> Peter.
>
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