One recently submitted paperSolving Hard Lattice Problems and the Security of Lattice-Based Cryptosystems (with Thijs Laarhoven and Joop van de Pol).
Three recently accepted papersDiscrete Distributions in the Tardos Scheme, Revisited (with Thijs Laarhoven), accepted at ACM IH&MMsec 2013.
Symbolic Privacy Analysis through Linkability and Detectability (with Meilof Veeningen and Nicola Zannone), accepted at IFIP TM 2013.
Dynamic Tardos traitor tracing schemes (with Thijs Laarhoven, Jeroen Doumen, Peter Roelse and Boris Škorić), to appear in IEEE Transactions on Information Theory, 2013.
Four recently published papersFormal Modelling of (De)Pseudonymisation: A Case Study in Health Care Privacy, (with Meilof Veeningen and Nicola Zannone), In Proceedings STM 2012, Springer LNCS Vol. 7783, 2013.
The Collatz conjecture and De Bruijn graphs (with Thijs Laarhoven), Indagationes Mathematicae, online-first publication, 2013.
Chosen-prefix Collisions for MD5 and Applications (with Marc Stevens and Arjen Lenstra), International Journal of Applied Cryptography, 2012.
Optimal symmetric Tardos traitor tracing schemes (with Thijs Laarhoven), Designs, Codes and Cryptography, online-first publication, 2012.
Record for the xyz conjectureThe xyz conjecture by Lagarias and Soundararajan states that for coprime positive integer triples x, y, z such that x + y = z, the quality function Q*(x,y,z) = 3/2 (loglog z) / (log P), where P is the largest prime factor of xyz, has lim sup Q* = 1.
The best known value for Q* is 1.63904, from the example 1 + 4374 = 4375.
Here's an updated (May 14, 2012) short report on my further findings, as well as a file with 1737 examples with Q* > 1.4.
I challenge you all to find a better example.
My Hagelin BC-38
Serial number 2885.
Comes from the Dutch Army, saved from destruction, thanks to Ruud.
Repaired and made fully functional by the CryptoMuseum Eindhoven, thanks to Marc and Paul.
See also my apparaten pages.