On 24/02/17 07:08, blake.mor...@trustis.com wrote:
> Certificates for the HMRC SET Service are issued from the SHA-1 “FPS
> TT Issuing Authority”, which is now only used for this service.  The
> replacement server certificate for hmrcset.trustis.com was issued
> from the FPS TT IA, via a manual process under the mistaken belief
> that this was necessary for this particular service to operate
> correctly.

And presumably under the further mistaken belief that "necessary for
this particular service to operate correctly" was a good enough reason
to disregard the SHA-1 ban?

> Trustis has some time ago, migrated all TLS certificate production to
> SHA-256 Issuing Authorities.  The small number of previously issued
> SHA-1 TLS certificates issued from “FPS TT”, that had lifetimes
> extending beyond 1 Jan 2017, were revoked towards the end of 2016.

Except the one in use on hmrcset.trustis.com? It's not clear how the
certificate-nearing-expiry for that domain fits into the last sentence
of the paragraph above.

> As a result of the investigation the security management committee
> has made a number of recommendations.  Principal amongst these is
> enhanced training and oversight for technical staff that deal with
> unique certificates or certificate management in complex
> circumstances that are not part of standard operations.

Have you deleted, locked or otherwise made unavailable all SHA-1
profiles which relate to intermediates which chain up to publicly
trusted roots?

Gerv
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