Traffic Authorities, Tax Authorities, Welfare Services, Data Interception Authorities and lots of government agencies use the digital certificates of DigiNotar which enable secure communications.
An unexpected and unwelcome example of how eavesdropping by the Iranian government can ultimately affect the entire Dutch government administration and its communication with Dutch citizens.
Dutch language news article:
http://www.nu.nl/internet/2604862/zoek-gevaren-dreigende-uitval-it-uit.html
Previously:
http://vrritti.com/?s=diginotar