4. More about digital ID Status

• Just like a file, a digital ID can get corrupted, lost, tempered with, etc.

• Digital IDs are time-sensitive and may expire after a period of time.

• To verify digital ID status, browser or email client can contact the certificate authority...
   (a) via internet, or (b) certificate server may be present directly on the LAN...
   (c) requesting information about the digital ID in question...
   (d) Certification authority sends back digital ID status, whether it has been revoked, etc.

• Security warning is generated by the browser or email client.

• The warning contains problem details.

• The user can decide whether to view the content or cancel.