International Association for Cryptologic Research

Ph.D. Database

The aim of the IACR Ph.D. database is twofold. On the first hand, we want to offer an overview of Ph.D. already completed in the domain of cryptology. Where possible, this should also include a subject classification, an abstract, and access to the full text. On the second hand, it deals with Ph.D. subjects currently under investigation. This way, we provide a timely map of contemporary research in cryptology. All entries or changes need to be approved by an editor. You can contact them via phds (at)


Helger Lipmaa (#207)
Name Helger Lipmaa
Personal Homepage
Institution University of Tartu
Topic of his/her doctorate. Secure and Efficient Time-Stamping Systems
Category applications
Keywords hash functions, public-key infrastructure, time-stamping
Ph.D. Supervisor(s) Mati Tombak
Year of completion 1999
Last Change 2011-02-14 10:54:10
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Helger Lipmaa's Students

Sven Laur - Cryptographic Protocol Design (cryptographic protocols)
Rafik Chaabouni - Enhancing Privacy Protection: Set Membership, Range Proofs, and the Extended Access Control (cryptographic protocols)

Contact: phds (at)

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