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Description
This extension is used to contain date of the certificate compromise.
The following paragraph is taken from RFC 2459 (Housley, et. al.), part 5.3.3:
«The invalidity date is a non-critical CRL entry extension that
provides the date on which it is known or suspected that the private
key was compromised or that the certificate otherwise became invalid.
This date may be earlier than the revocation date in the CRL entry,
which is the date at which the CA processed the revocation. When a
revocation is first posted by a CA in a CRL, the invalidity date may
precede the date of issue of earlier CRLs, but the revocation date
SHOULD NOT precede the date of issue of earlier CRLs. Whenever this
information is available, CAs are strongly encouraged to share it
with CRL users.
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