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The Cryptography Group at the Institute of Computer Science at the University of Tartu invites applications for a PhD position in lattice-based cryptography. The successful candidate will work on the mathematics of lattices, with a particular focus on their applications in lattice-based cryptography, including discrete Gaussian sampling, digital signature schemes, and cryptographic reductions. Our group includes researchers with expertise in post-quantum cryptography, coding theory, and zk-SNARKs, fostering a collaborative, research-driven environment. This position offers the chance to work on topics that are both theoretically interesting and practically relevant in modern cryptography.

The candidate

Applicants should:

•  Hold (or complete by this spring) an MSc degree or equivalent

•  Have a strong background in mathematics and/or theoretical computer science

•  Have English proficiency

•  Prior knowledge of cryptography is desired

We particularly welcome candidates with experience in lattice-based cryptography, coding theory, or related areas in computer science and pure or applied mathematics. Female candidates are particularly encouraged to apply.

Estonia & University of Tartu

The University of Tartu is Estonia’s leading research university and a well-established center for computer science and cryptography. The PhD student will be based at the modern Delta Centre, located in central Tartu. A virtual tour of Tartu and the Delta Centre is available here.

Estonia is known for its advanced digital infrastructure, safe and peaceful environment, and high quality of life. Tartu is a lively university town with an international student community, short commuting times, and easy access to nature.

The PhD salary is approximately €1900 per month (net). Living costs in Tartu are moderate. For example, a one-bedroom apartment in the city center typically costs under €600 per month. The position also includes additional benefits such as travel budget, social activities, language courses, and relocation assistance.

This position offers the opportunity to pursue high-level research in a focused, supportive environment while living in a safe, well-connected European university city.

Application

For any inquiries or to apply for the position, submit a letter of motivation (clearly stating why this project and the applicant are a good match), a CV, and the names of two references to Maiara Bollauf (maiara.bollauf at ut.ee). The PhD position starts on September 1, 2026, and lasts four years. The candidate may later seek further employment, but this is not guaranteed in advance.

The application deadline is: April 10, 2026.

Other PhD and postdoc positions in the area of zero-knowledge are available in our group's website.

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