Improving the Availability of Time-Stamping Services. - Arne Ansper; Ahto Buldas; Märt Saarepera; Jan Willemson (ACISP, 2001)

Efficient Long-Term Validation of Digital Signatures. - Arne Ansper; Ahto Buldas; Meelis Roos; Jan Willemson (Public Key Cryptography, 2001)

Scalable and Efficient PKI for Inter-Organizational Communication. - Arne Ansper; Ahto Buldas; Margus Freudenthal; Jan Willemson (ACSAC, 2003)

A Secure and Scalable Infrastructure for Inter-Organizational Data Exchange and eGovernment Applications. - Jan Willemson; Arne Ansper (ARES, 2008)

Security and Trust for the Norwegian E-Voting Pilot Project E-valg 2011. - Arne Ansper; Sven Heiberg; Helger Lipmaa; Tom André Øverland; Filip van Laenen (NordSec, 2009)

Designing a Governmental Backbone. - Arne Ansper (NordSec, 2011)

Protecting a Federated Database Infrastructure against Denial-of-Service Attacks. - Arne Ansper; Ahto Buldas; Margus Freudenthal; Jan Willemson (CRITIS, 2013)

High-Performance Qualified Digital Signatures for X-Road. - Arne Ansper; Ahto Buldas; Margus Freudenthal; Jan Willemson (NordSec, 2013)