Tomer Ashur

Research

  • Cryptanalysis of symmetric-key primitive
  • Developing new statistical attacks

I understand systems. Then I break them.

Projects

  1. STARK-friendly cryptographic primitives (https://www.esat.kuleuven.be/cosic/jarvis-and-friday-stark-friendly-cryptographic-primitives)
  2. New crypto design for Tor relay cells: https://lists.torproject.org/pipermail/tor-dev/2018-July/013279.html

Biography

I was born in 1983 and things mostly improved since.

Latest work

  1. New potentially interesting linear property for DES (https://eprint.iacr.org/2018/635)
  2. Embarrassing security vulnerability in high-end cars (https://www.wired.com/story/hackers-steal-tesla-model-s-seconds-key-fob/, https://www.esat.kuleuven.be/cosic/fast-furious-and-insecure-passive-keyless-entry-and-start-in-modern-supercars/)

Publications

1. S. D'haeseleer, "Hardware design for cryptanalysis," Master thesis, KU Leuven, T. Ashur, D. Sijacic, and I. Verbauwhede (promotors), 79 pages, 2019.
2. T. Ashur, O. Dunkelman, and N. Masalha, "Linear Cryptanalysis Reduced Round of Piccolo-80," In 3rd International Symposium on Cyber Security Cryptology and Machine Learning (CSCML 2019), Lecture Notes in Computer Science 11527, S. Dolev, D. Hendler, S. Lodha, and M. Yung (eds.), Springer-Verlag, pp. 16-32, 2019.
3. L. Wouters, E. Marin, T. Ashur, B. Gierlichs, and B. Preneel, "Fast, Furious and Insecure: Passive Keyless Entry and Start Systems in Modern Supercars," Transactions on Cryptographic Hardware and Embedded Systems 2019(3), pp. 66-85, 2019.
4. T. Ashur, S. Cancela, J. David Calle, I. Fernandez-Hernandez, V. Rijmen, and C. Sarto, "Toward an Operational Navigation Message Authentication Service: Proposal and Justification of Additional OSNMA Protocol Features," In , 6 pages, 2019.
5. T. Ashur, and A. Luykx, "An Account on the ISO/IEC Standardization of Simon and Speck," In Real World Crypto 2019, 2 pages, 2019.
6. T. Ashur, B. Gierlichs, E. Marin, B. Preneel, and L. Wouters, "Fast, Furious and Insecure: Passive Keyless Entry and Start Systems in Modern Supercars (Invited talk)," Real World Crypto, San Jose, CA, USA, 2019.
7. T. Ashur, M. Eichlseder, M. M. Lauridsen, G. Leurent, B. Minaud, Y. Rotella, Y. Sasaki, and B. Viguier, "Cryptanalysis of MORUS," In Advances in Cryptology - ASIACRYPT 2018, Lecture Notes in Computer Science, S. Galbraith, and T. Peyrin (eds.), Springer-Verlag, 26 pages, 2018.
8. T. Ashur, and A. Luykx, "An Account of the ISO/IEC Standardization of the Simon and Speck Block Cipher Families," In Security of Ubiquitous Computing Systems (Selected Topics), G. Avoine, and J. Hernandez-Castro (eds.), Springer-Verlag, pp. 47-64, 2018.
9. L. Wouters, E. Marin, T. Ashur, B. Gierlichs, and B. Preneel, "Fast, Furious and Insecure: Passive Keyless Entry and Start Systems in Modern Supercars," ESCAR EU 2018, Brussels, BE, 2018.
10. T. Ashur, S. Dhooghe, and V. Rijmen, "Jarvis and Friday---STARK-Friendly Cryptographic Primitives," Prepared at the request of StarkWare Industries, 15 pages, 2018.
11. T. Ashur, and R. Posteuca, "On Linear Hulls in One Round of DES," In BalkanCryptSec 2018, Lecture Notes in Computer Science, F. Laurentiu Tiplea, and B. Warinschi (eds.), Springer-Verlag, 11 pages, 2018.
12. T. Ashur, "Linear Cryptanalysis Using Low-Bias Approximations," Dagstuhl Seminar on Symmetric Cryptography, Dagstuhl, Germany, 2018.
13. T. Ashur, "Cryptanalysis of Symmetric-Key Primitives," PhD thesis, KU Leuven, V. Rijmen (promotor), 214 pages, 2017.
14. T. Ashur, J. Delvaux, S. Lee, P. Maene, E. Marin, S. Nikova, O. Reparaz, V. Rozic, D. Singelée, B. Yang, and B. Preneel, "A Privacy-Preserving Device Tracking System Using a Low-Power Wide-Area Network (LPWAN)," In 16th International Conference on Cryptology and Network Security, CANS 2017, Lecture Notes in Computer Science, Springer-Verlag, 22 pages, 2017.
15. T. Ashur, G. De Witte, and Y. Liu, "An Automated Tool for Rotational-XOR Cryptanalysis of ARX-based Primitives," In Proceedings of the 38th Symposium on Information Theory in the Benelux, Werkgemeenschap voor Informatie- en Communicatietheorie, pp. 59-66, 2017.
16. A. Ranea, Y. Liu, and T. Ashur, "An Easy-to-Use Tool for Rotational-XOR Cryptanalysis of ARX Block Ciphers," Proceedings of the Romanian Academy, Series A 18(3), pp. 307-316, 2017.
17. T. Ashur, O. Dunkelman, and A. Luykx, "Boosting Authenticated Encryption Robustness with Minimal Modifications," In Advances in Cryptology - CRYPTO 2017, Lecture Notes in Computer Science, J. Katz, and H. Shacham (eds.), Springer-Verlag, pp. 3-33, 2017.
18. T. Ashur, G. De Witte, Y. Liu, and A. Ranea, "Rotational-XOR Cryptanalysis of Reduced-round SPECK," IACR Transactions on Symmetric Cryptology 2017(3), pp. 24-36, 2017.
19. G. De Witte, "Automatic SAT-solver Based Search Tools for Cryptanalysis," Master thesis, KU Leuven, T. Ashur, Y. Liu, and V. Rijmen (promotors), 61 pages, 2017.
20. A. Ranea, "An Easy to Use Tool for Rotational-XOR Cryptanalysis of ARX Block Ciphers," Master thesis, KU Leuven, T. Ashur, Y. Liu, and V. Rijmen (promotors), 81 pages, 2017.
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