* Dates within the next 7 days are marked by a star.
Matematiikan kandiseminaari (Bachelor thesis seminar in Math.)
* Friday 03 October 2025, 09:15, M3 (M234)
Further information
Ohjelma: https://mycourses.aalto.fi/course/view.php?id=34597#module-908887
Velma Pohjonen
Bayesian modelling of a carbon farming experiment (MSc thesis presentation)
* Wednesday 08 October 2025, 10:15, M2 (M233)
Prof. Iván Blanco Chacón (U. Alcalá)
The LAC cryptosystem. A realistic alternative to Kyber?
Thursday 09 October 2025, 15:15, M3 (M234)
We discuss the LAC cryptosystem, which was presented to the NIST contest and although discarded in the outcome of the third round, was seriously considered as a rival for Kyber and is recently regaining attention from other different public committees.
One of the main features of LAC is the small modulus size, which is taken of the order of bytes, in comparison with Kyber, where q is at least 3329. This fact renders LAC one of the most compact cryptosystems, suitable to be used for small devices and with the same reduction security warranties as other RLWE-based schemes. However, the smallness of q brings an extra difficulty: the absence of NTT, which implies an obvious decrease in efficiency. This is overcome by the use of error correction in the cyphertext.
As proved by the authors, LAC outperforms Kyber at 128 and 256 bits security levels in terms of key size and cyphertext size while remaining more geneours in the security margin. It is true that these security levels are not recommended nowadays by NIST anymore, but the authors also suggested that LAC-192-v3b may be considered to achieve NIST Security Level 5 since it outperforms Kyber 1024 at this level. The goal of this talk is to report about this claim after the introduction of the foundations of the cryptosystem.
ANTA Seminar / Hollanti et al.
Dissertation
Okko Makkonen
PhD Defence: Algebraic methods for secure coded computing
Friday 10 October 2025, 12:00, M1 (M232)
Further information
ANTA Seminar / Hollanti et al.
Dr. Thomas Wasserman (Aalto University)
TBA
Tuesday 14 October 2025, 10:15, M3 (M234)
Prof. Gretchen Matthews (Virginia Tech)
TBA
Tuesday 14 October 2025, 15:15, M1 (M232)
TBA
Prof. Gretchen Matthews (Virginia Tech)
Colloquium talk (TBA)
Tuesday 14 October 2025, 15:15, M1 (M232)
Further information
Prof. Christian Webb (University of Helsinki)
Fractional charge correlation functions in the sine-Gordon model and twisted fermions
Tuesday 21 October 2025, 10:15, M3 (M234)
The sine-Gordon model is a fascinating model of two-dimensional quantum field theory. It is not a conformal field theory, but it is believed to enjoy many interesting properties. This talk will focus on one of these properties known as bosonization. I will discuss how at the so-called free fermion point of the model, certain correlation functions of the sine-Gordon model are tau functions related to two-dimensional Dirac operators with twisting. This talk is based on joint work with Roland Bauerschmidt and Scott Mason.
Theo Elenius
TBA
Wednesday 22 October 2025, 10:15, M3 (M234)
Seminar on analysis and geometry
Dr. Augustin Lafay (Aalto University)
TBA
Tuesday 28 October 2025, 10:15, M3 (M234)
Henri Lahdelma
TBA
Wednesday 29 October 2025, 10:15, M3 (M234)
Seminar on analysis and geometry
Prof. Gerardo Barrera (Instituto Superior Técnico Lisboa)
Asymptotic Behavior of the Condition Number of Random Circulant Matrices
Wednesday 29 October 2025, 14:15, M2 (M233)
We analyze the asymptotic distribution of the extremal singular values of random circulant matrices generated by sequences of independent and identically distributed random variables satisfying the Lyapunov condition. Under an appropriate normalization, we establish that, as the matrix dimension tends to infinity, the joint distribution of the largest and smallest singular values converges in distribution to the independent product of Rayleigh and Gumbel laws. This result directly implies that a suitably normalized condition number of such matrices converges in distribution to a Fréchet law in the large-dimensional limit. The condition number serves as a quantitative measure of the sensitivity of linear systems to infinitesimal perturbations of the input. The proof relies on the classical coupling method of EinmahlKomlósMajorTusnády to achieve precise probabilistic control over the spectral extremes. This is a joint contribution with Paulo Manrique (Extremes, 2022).
Stochastics Seminar
Prof. Tuomas Hytönen (Aalto University)
TBA
Tuesday 09 December 2025, 15:15, M1 (M232)
TBA
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