Buldas was a leading contributor to the Estonian Digital Signature Act and ID-card from 1996 to 2002, currently the only national-level public-key infrastructure (PKI) which has achieved widespread adoption by a country's population for legally binding digital signatures.
Orson Scott Card | Estonian language | credit card | card game | Discover Card | smart card | punched card | QSL card | Christmas card | VISA (credit card) | Penalty card | Maestro (debit card) | Estonian War of Independence | United Bank Card | Pokémon Trading Card Game | Estonian kroon | debit card | Yu-Gi-Oh! Trading Card Game | Playing card | Payment Card Industry Data Security Standard | Orson Scott Card's InterGalactic Medicine Show | Hong Kong Identity Card | Estonian Philharmonic Chamber Choir | Estonian Academy of Arts | Credit card | card | Visiting card | United States Playing Card Company | Treaty of Tartu (Russian–Estonian) | Three card brag |