PhD Student at Université Paris-Saclay/CEA-List working on fully homomorphic encryption. Research at the intersection of applied mathematics, cryptography and high-performance computing.https://jdumezy.com/https://jdumezy.com/blog/bivariate-ckks/https://jdumezy.com/blog/bivariate-ckks/CKKS without a prime chain: the bivariate representation in poulpy.Sat, 23 May 2026 00:00:00 GMThttps://jdumezy.com/blog/securitynotionszoo/https://jdumezy.com/blog/securitynotionszoo/An interactive taxonomy of cryptographic security notions for Fully Homomorphic Encryption - formal definitions, an implication map, labelled transform routes, a beginner-friendly primer, and games.Sat, 18 Apr 2026 00:00:00 GMThttps://jdumezy.com/blog/fhe-sparse-key-security/https://jdumezy.com/blog/fhe-sparse-key-security/What sparse keys are, why they matter for FHE performance, and how to estimate their concrete security with the lattice estimator and precomputed tables.Mon, 30 Mar 2026 00:00:00 GMThttps://jdumezy.com/blog/ckks-functional-bootstrapping/https://jdumezy.com/blog/ckks-functional-bootstrapping/Introduction to CKKS functional bootstrapping for evaluating (large) LUTs.Wed, 08 Oct 2025 00:00:00 GMThttps://jdumezy.com/blog/openfhe-crash-course/https://jdumezy.com/blog/openfhe-crash-course/Install, run examples and start developing with OpenFHE.Fri, 25 Jul 2025 00:00:00 GMT