Dr Christophe Petit PhD

Dr Christophe Petit

School of Computer Science
Senior Lecturer in Computer Security

Contact details

Address
School of Computer Science
University of Birmingham
Edgbaston
Birmingham
B15 2TT
UK

I am a Senior Lecturer at the University of Birmingham's School of Computer Science, and a member of the Security and Privacy research group. I teach the Secure Programming and part of the Advanced Cryptography modules at Birmingham, both of them part of our Master in Cybersecurity.

For more information, please see Christophe's Computer Science profile.

Biography

I am a Lecturer in Computer Security in the University of Birmingham's School of Computer Science, and a member of the Security and Privacy research group. I am also actively involved within Oxford's Mathematical Institute, where I helped founding the Cryptography group.

I teach the Secure Programming and part of the Advanced Cryptography modules at Birmingham, both of them part of our Master in Cybersecurity. I will also teach an Advanced Cryptography reading course for the Master in Mathematics and Foundations of Computer Science at Oxford.

I am always willing to supervise good and well-motivated students at undergraduate, master and PhD levels. Have a look at previous student projects and feel free to contact me to learn more about potential research projects.

Previously I was a Research Fellow at the University of Oxford's Mathematical Institute, and prior to that I worked at Université catholique de Louvain's Department of Electrical Engineering and at University College London's Computer Science Department.

Teaching

  • Advanced Cryptography
  • Secure Programming

Postgraduate supervision

  • 2018 Alex Litowczuk Post-quantum cryptography. 
  • 2018 Ran Pang Post-quantum cryptography. 

Research

My main research interests are in Cryptography and related topics, mostly at the intersection of Mathematics and Computer Science.

Publications

Recent publications

Article

Booher, J, Bowden, R, Doliskani, J, Fouotsa, TB, Galbraith, SD, Kunzweiler, S, Merz, S-P, Petit, C, Smith, B, Stange, KE, Ti, YB, Vincent, C, Voloch, JF, Weitkämper, C & Zobernig, L 2024, 'Failing to Hash Into Supersingular Isogeny Graphs', The Computer Journal, vol. 67, no. 8, pp. 2702-2719. https://doi.org/10.1093/comjnl/bxae038

Beullens, W, De Feo, L, Galbraith, SD & Petit, C 2023, 'Proving knowledge of isogenies: a survey', Designs, Codes and Cryptography. https://doi.org/10.1007/s10623-023-01243-3

Kliuchnikov, V, Lauter, K, Minko, R, Paetznick, A & Petit, C 2023, 'Shorter quantum circuits via single-qubit gate approximation', Quantum, vol. 7, 1208. https://doi.org/10.22331/q-2023-12-18-1208

Conference contribution

Bhattacharyya, R, Kollath, S & Petit, C 2025, Code-based Fully Dynamic Accountable Ring Signatures and Group Signatures using the Helper Methodology. in Information Security and Privacy: 30th Australasian Conference on Information Security and Privacy, ACISP 2025, Sydney, NSW, Australia, July 14-16, 2025, Proceedings. Lecture Notes in Computer Science, Springer, 30th Australasian Conference on Information Security and Privacy, Wollongong, New South Wales, Australia, 14/07/25.

Chen, M & Petit, C 2025, Computing the endomorphism ring of a supersingular elliptic curve from a full rank suborder. in 44th Annual International Conference on the Theory and Applications of Cryptographic Techniques. Lecture Notes in Computer Science, Springer, 44th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Madrid, Spain, 4/05/25.

Cai, S, Chen, M & Petit, C 2025, Faster algorithms for isogeny computations over extensions of finite fields. in A Dąbrowski, J Pieprzyk & J Pomykała (eds), Number-Theoretic Methods in Cryptology: 4th International Conference, NuTMiC 2024, Szczecin, Poland, June 24–26, 2024, Revised Selected Papers. 1 edn, Lecture Notes in Computer Science, vol. 14966, Springer, pp. 136-155, Number-Theoretic Methods in Cryptology 2024, Szczecin, Poland, 24/06/24.

Kunzweiler, S, Maino, L, Moriya, T, Petit, C, Pope, G, Robert, D, Stopar, M & Ti, YB 2025, Radical 2-isogenies and cryptographic hash functions in dimensions 1, 2 and 3. in Public-Key Cryptography – PKC 2025. Lecture Notes in Computer Science, Springer, 28th IACR International Conference on Practice and Theory of Public-Key Cryptography, Røros, Norway, 12/05/25.

Benčina, B, Kutas, P, Merz, S-P, Petit, C, Stopar, M & Weitkämper, C 2024, Improved algorithms for finding fixed-degree isogenies between supersingular elliptic curves. in L Reyzin & D Stebila (eds), Advances in Cryptology – CRYPTO 2024: 44th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 18–22, 2024, Proceedings, Part V. vol. 5, Lecture Notes in Computer Science, vol. 14924, Springer, pp. 183-217, CRYPTO 2024, 18/08/24. https://doi.org/10.1007/978-3-031-68388-6_8

Chen, M, Lai, Y-F, Laval, A, Marco, L & Petit, C 2024, Malleable Commitments from Group Actions and Zero-Knowledge Proofs for Circuits based on Isogenies. in A Chattopadhyay, S Bhasin, S Picek & C Rebeiro (eds), Progress in Cryptology – INDOCRYPT 2023: 24th International Conference on Cryptology in India, Goa, India, December 10–13, 2023, Proceedings, Part I. 1 edn, Lecture Notes in Computer Science, vol. 14459, Springer, pp. 221–243, 24th International Conference on Cryptology in India, Goa, India, 10/12/23. https://doi.org/10.1007/978-3-031-56232-7_11

Gilchrist, V, Marco, L, Petit, C & Tang, G 2024, Solving the Tensor Isomorphism Problem for special orbits with low rank points: Cryptanalysis and repair of an Asiacrypt 2023 commitment scheme. in L Reyzin & D Stebila (eds), Advances in Cryptology – CRYPTO 2024: 44th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 18–22, 2024, Proceedings, Part I. Lecture Notes in Computer Science, vol. 14920, Springer, pp. 141-173, CRYPTO 2024, 18/08/24. https://doi.org/10.1007/978-3-031-68376-3_5

Chen, M, Imran, M, Ivanyos, G, Kutas, P, Leroux, A & Petit, C 2023, Hidden Stabilizers, the Isogeny To Endomorphism Ring Problem and the Cryptanalysis of pSIDH. in J Guo & R Steinfeld (eds), Advances in Cryptology – ASIACRYPT 2023: 29th International Conference on the Theory and Application of Cryptology and Information Security, Guangzhou, China, December 4–8, 2023, Proceedings, Part III. 1 edn, vol. 3, Lecture Notes in Computer Science, vol. 14440, Springer, Singapore, pp. 99-130, 29th International Conference on the Theory and Application of Cryptology and Information Security, ASIACRYPT 2023, Guangzhou, China, 4/12/23. https://doi.org/10.1007/978-981-99-8727-6_4

Fouotsa, TB, Moriya, T & Petit, C 2023, M-SIDH and MD-SIDH: countering SIDH attacks by masking information. in C Hazay & M Stam (eds), Advances in Cryptology – EUROCRYPT 2023: 42nd Annual International Conference on the Theory and Applications of Cryptographic Techniques, Lyon, France, April 23-27, 2023, Proceedings. 1 edn, Lecture Notes in Computer Science, vol. 14008, Springer, pp. 282-309, 42nd Annual International Conference on the Theory and Applications of Cryptographic Techniques, Lyon, France, 23/04/23. https://doi.org/10.1007/978-3-031-30589-4_10

Fouotsa, TB & Petit, C 2022, A new adaptive attack on SIDH. in SD Galbraith (ed.), Topics in Cryptology – CT-RSA 2022: Cryptographers’ Track at the RSA Conference 2022, Virtual Event, March 1–2, 2022, Proceedings. 1 edn, Lecture Notes in Computer Science, vol. 13161, Springer, pp. 322-344, Cryptographers’ Track RSA Conference, 7/02/22. https://doi.org/10.1007/978-3-030-95312-6_14

Editorial

Otmani, A, Petit, C & Tibouchi, M 2023, 'Guest Editorial on special issue: Cryptanalysis of (NIST PQC) post-quantum proposals', IET Information Security. https://doi.org/10.1049/ise2.12105

Foreword/postscript

Vaudenay, S & Petit, C 2024, Preface. in S Vaudenay & C Petit (eds), Progress in Cryptology - AFRICACRYPT 2024: 15th International Conference on Cryptology in Africa, Douala, Cameroon, July 10–12, 2024, Proceedings. 1 edn, Lecture Notes in Computer Science, vol. 14861, Springer, pp. v-vi, 15th International Conference on Cryptology in Africa, AFRICACRYPT 2024, Douala, Cameroon, 10/07/24. https://doi.org/10.1007/978-3-031-64381-1

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