Sorina Ionica

Email : sorina.ionica @ (best way to reach me, wherever I am)

I currently hold a post-doc position at University of Bordeaux, in the number theory and cryptography group. I completed my PhD in 2010 at University of Versailles, under the supervision of Antoine Joux. For details, you may take a look at my CV.

I work in the area of algorithmic number theory and its applications to cryptography. Lately, I have been working on


Journal papers :

  • Sorina Ionica and Antoine Joux, Pairing the Volcano, extended version of the ANTS paper. Added an algorithm for endomorphism ring computation.
    Mathematics of Computation, 82(201), 2013 Article
  • Sorina Ionica, Pairing-based methods for jacobians of genus 2 curves with maximal endomorphism ring, Journal of Number Theory, pp. 3755-3770, 133(11), 2013 Article

    Publications in international conferences with proceedings :

  • Sorina Ionica et Antoine Joux, Another Approach to Pairing Computation in Edwards Coordinates in Progress in Cryptography - Indocrypt 2008, volume 5365 of Lectures Notes in Computer Science, pp.400--413, Springer 2008 Article
  • Sorina Ionica et Antoine Joux, Pairing the Volcano in Proceedings of Algorithmic Number Theory Symposium, volume 6197 of Lectures Notes in Computer Science, pp. 201--218, Springer 2010. Article
  • Sorina Ionica et Antoine Joux, Pairing computation for elliptic curves with efficiently computable endomorphism and small embedding degree dans Proceedings of Pairing-based Cryptography -Pairing 2010, volume 6487 of Lecture Notes in Computer Science, pp. 435-449, Springer, 2010. Article
  • Nadia El Mrabet et Aurore Guillevic et Sorina Ionica, Efficient multiplication in finite field extensions of degree 5, dans Progress in Cryptology - AFRICACRYPT 2011 - 4th International Conference on Cryptology in Africa, volume 6737 of Lecture Notes in Computer Science, pp. 188-205, Springer, 2011 Article
  • Aurore Guillevic and Sorina Ionica, Four-dimensional GLV via the Weil restriction , Asiacrypt 2013, volume 8269 of Lecture Notes in Computer Science, pp 79-96, 2013. Article Maple code for isogeny computation


    I defended my thesis Algorithmique des couplages et cryptographie on the 14th of May 2010.


  • Sorina Ionica and Emmanuel Thome, Isogeny graphs with maximal real multiplication, Preprint
  • Sorina Ionica and Malika Izabachene, Weak instances of composite order protocols, Preprint
  • Jennifer Balakrishnan, Sarah Chisholm, Sorina Ionica, Kristin Lauter and Christelle Vincent, A conjecture on the values of chi18 , in preparation

    Invited talks

  • Software

  • ScalarMult is a C++ implementation of scalar multiplication on several families of elliptic curves and genus 2 Jacobians.

  • .

    During my PhD, I was a "moniteur" in Computer Science at the University of Versailles. In 2013, I was an ATER at ENS Paris.

  • Past courses

  • This quarter at UCSD : Subexponential algorithms for factoring and discrete logarithms



    I have served/will serve on the following program committees: SAC 2013, Pairing 2013, LATINCRYPT 2014

    Between 2001 and 2003, I was un undergraduate student of SNSB.

    Date de dernière mise à jour : 3 mars 2014