1-2 PhD Students in Computer Science

Umeå University is one of Sweden's largest institutions of higher education, with over 41,500 students and approximately 4,600 employees. The university offers a diverse range of high-quality education programs and world-leading research in several scientific fields. It was here that the groundbreaking discovery of the CRISPR-Cas9 gene-editing tool was made, which was awarded the Nobel Prize in Chemistry. At Umeå University, everything is close by. Our cohesive campus makes it easy to meet, collaborate, and exchange knowledge, fostering a dynamic and open culture. Interested in learning more? Read more about Umeå University as a workplace. Our department conducts research at the highest international level and provides several high-quality education programs in computer science. We are now recruiting 1–2 PhD students with a focus on cryptography and cybersecurity. The Department of Computing Science at Umeå University is internationally recognized for excellent research and teaching. We are affiliated with WASP – Sweden's largest single research program to date, coordinate its sister program WASP-HS focusing on the implications of new technology, and are a strong partner in the national strategic research program eSSENCE. Read more at the Department of Computing Science. The Wallenberg AI, Autonomous Systems and Software Program, WASP, is Sweden's largest single research program in modern times. The program creates a platform for academic research and education in close collaboration with leading Swedish technology-intensive industry. Learn more: https://wasp-sweden.org The WASP Graduate School aims to equip future researchers with the necessary knowledge to analyze, develop, and actively contribute to the interdisciplinary advancement of artificial intelligence, autonomous systems, and software. Through an ambitious program featuring research visits, partner universities, and guest lecturers, the graduate school actively supports the formation of a strong multidisciplinary and international professional network among PhD students, researchers, and industry. More information: https://wasp-sweden.org/graduate-school/ Project Description The project focuses on the design and analysis of modes of operation for symmetric-key cryptography, including, but not limited to, message authentication codes, pseudorandom functions, encryption schemes, permutation-based functions, hash functions, and hash-based signatures, for applications such as quantum-safe and post-quantum cryptography, as well as leakage- and tampering-resistant cryptography. The project is supervised by Assistant Professor Mustafa Khairallah. The research is expected to include a mix of theory and practice. The selected students will be part of the Department of Computing Science at Umeå University, as well as WASP's graduate school. Possible research directions include: Design and analysis of leakage-resistant encryption schemes with variable length, focusing on stream ciphers and wide-block ciphers (permutation-based modes). Theoretical analysis of emerging modes of operation and emerging threat models. Studies of security notions, attacks, and proofs for hash-based signatures, with focus on physical attacks. Qualifications To be admitted to doctoral-level education, the applicant must have basic eligibility through a completed degree at the advanced level, or completed course requirements of at least 240 higher education credits, of which at least 60 credits are at the advanced level, or equivalent foreign education, or equivalent qualifications. To be admitted to doctoral-level education in the subject of computer science, the applicant must have completed courses of at least 90 higher education credits in computer science or directly relevant to the current specialization. Specifically for this position, it is required that you: have documented knowledge of cryptography concepts. have documented knowledge of probability theory, programming, and linear algebra. can read and write mathematical proofs and cryptographic analyses. have strong academic English proficiency. For directions 1 and 3, it is meritorious if you: have experience with hardware implementation, hardware description languages, and/or FPGA implementation. have experience with side-channel attacks against cryptosystems. have experience with cryptographic implementation, such as software and/or hardware implementation of cryptographic algorithms (not limited to symmetric-key algorithms). For direction 2, it is meritorious if you: have experience with algorithms, computational theory, quantum computing, and discrete mathematics. have experience with design or analysis of modes of operation (including implementation work). We are looking for someone who thrives in a team environment and is open to collaboration with other team members. Knowledge of cryptography can be demonstrated through official course transcripts from bachelor's and master's studies or equivalent, a thesis, or published research articles. About the Position The employment is aimed at a doctoral degree, and the PhD student's primary task is to engage in doctoral studies, which includes participation in research projects and doctoral courses. Teaching and other departmental duties (up to a maximum of 20%) may be included in the work tasks. The employment is limited to four years full-time or up to five years with part-time teaching. Salary placement follows the established salary schedule for PhD student employment. According to the Higher Education Ordinance (Chapter 12, Section 2), the decision on employment cannot be appealed. A complete application must include: A personal letter describing your research interests and why you are applying for the advertised position. The letter must also include your contact information. Copies of degree certificates or equivalent Curriculum Vitae (CV) Contact information for at least two references who know you through previous work or mentorship Copies of bachelor's and/or master's thesis, as well as other relevant publications if available Documentation and description of other relevant experience and qualifications The application must be written in Swedish or English. If attached documents are in another original language, a translation must be included. Attached documents must be in PDF. The application must be received no later than 2026-09-15.

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