PhD on Symmetric Cryptography over Prime Fields and Integer Rings

Job Description

Symmetric-key cryptography is of vital importance in the field of cybersecurity and data protection, offering tools for data encryption and authentication. While public-key cryptography is crucial for exchanging the key or signing data, symmetric cryptography guarantees better performance and faster speed for encrypting data.

Without doubt, AES (Advanced Encryption Standard) and Keccak/SHA-3 (Secure Hash Algorithm 3) are the two most used and famous symmetric cryptography algorithms. Winners of the standardization processes sponsored by the U.S. National Institute of Standards and Technology (NIST), they are currently adopted by the U.S. and the European governments. As the majority of the symmetric primitives published in the literature, they are designed to naturally operate over bits, in order to maximize their performances in Software and Hardware implementations.

At the current state of the art, the approach of designing symmetric primitives that naturally operate over bits is showing all its limit when those symmetric primitives are used in new emerging contexts, such as rising applications of practical importance including Format Preserving Encryption (FPE), Multi-Party Computation (MPC), Homomorphic Encryption (HE), and Zero-Knowledge (ZK). These applications are usually defined over prime finite fields, and more recently, even over integer rings. In order to work, such protocols and applications rely on the evaluation of symmetric cryptographic primitives (as ciphers and hash functions), whose details have a crucial impact on the performances of the considered application/protocol. From this point of view, using traditional symmetric primitives such as AES and Keccak/SHA-3 for performing operations over a prime fields or an integer ring represents a significant bottleneck in terms of performances.

As part of this project, your work will consist in designing, implementing, and analyzing dedicated symmetric  primitives operating directly over prime fields or integer rings, that can provide efficient solutions for rising applications of practical importance such as FPE, MPC, HE, and ZK.

Due to the novelty of these symmetric primitives, special attention will be given to their security, with the goals to improve the current cryptanalytic results, and to develop new innovative security arguments.

You will be supervised by Dr. Lorenzo Grassi in order to conduct research and publish the results at top-ranked international academic conferences and journals. You will be expected to collaborate with fellow PhD candidates and researchers from Coding Theory and Cryptology group in the Department of Mathematics and Computer Science and from other international institutions.

The successful candidate will be an integral part of the prestigious ERC Starting Grant “Getting SYMmetric CryPtography Out of its Comfort ZONe” (SYMPZON). SYMPZON aims to reshape the process of designing and analyzing symmetric algorithms that operate over the integer rings, by both developing a new theoretical framework, and by constructing concrete cryptographic primitives for practical use cases.

Profile

We are seeking a highly motivated PhD candidate to join our research team in cryptography. The ideal candidate will have a strong background in mathematics, computer sciences, engineering, or a closely related field. The candidate must be highly motivated and be able to demonstrate their potential for conducting original research in symmetric cryptography.

Job Requirements

• Hold a Master's degree (achieved with good results) in mathematics, computer science, engineering, or a related field, or you should expect to obtain such a degree soon.
• A good knowledge of algebra (including field and ring theories, and Gröbner basis) and good programming skills.
• A strong interest in cryptography, especially symmetric cryptography and its real-world deployment.
• If possible, some experience with (symmetric) cryptography.
• A research-oriented attitude.
• Fluent in spoken and written English (C1 level), with good communication, presentation and writing skills.
• A positive attitude and excellent interpersonal skills.
• Ability to work in a team and on own initiative.

Conditions of Employment

• A meaningful job in a dynamic and ambitious university, in an interdisciplinary setting and within an international network. You will work on a beautiful, green campus within walking distance of the central train station. In addition, we offer you: 
• Full-time employment for four years, with an intermediate assessment after nine months. You will spend a minimum of 10% of your four-year employment on teaching tasks, with a maximum of 15% per year of your employment. 
• Salary and benefits (such as a pension scheme, paid pregnancy and maternity leave, partially paid parental leave) in accordance with the Collective Labour Agreement for Dutch Universities, scale P (min. € 2,901 max. € 3,707).  
• A year-end bonus of 8.3% and annual vacation pay of 8%. 
• High-quality training programs and other support to grow into a self-aware, autonomous scientific researcher. At TU/e we challenge you to take charge of your own learning process. 
• An excellent technical infrastructure, on-campus children's day care and sports facilities.  
• An allowance for commuting, working from home and internet costs. 
• A Staff Immigration Team and a tax compensation scheme (the 30% facility) for international candidates. 

Information

Do you recognize yourself in this profile and would you like to know more? Please contact the hiring manager dr. Lorenzo Grassi, l.grassi@tue.nl.

Visit our website for more information about the application process or the conditions of employment. You can also contact HR Services, HRServices.MCS@tue.nl.

Are you inspired and would like to know more about working at TU/e? Please visit our career page.

Application

We invite you to submit a complete application by using the apply button. The application should include:

• Cover letter in which you describe your motivation and qualifications for the position.
• Curriculum vitae.
• Transcript of Master and Bachelor degrees.
• Copies of your final MSc thesis, including English abstract.
• If applicable, published papers in which you contributed as the main author (PDF files or links to read them if files are too large).
• Contact information of two academic referees.
• If possible, submit the results of your IELTS or TOEFL test (or equivalent).

We look forward to receiving your application and will screen it as soon as possible.

The vacancy is open until a suitable candidate has been found. Applications will be screened continuously, and we will conclude the recruitment as soon as we find the right candidate. The starting date is negotiable.