Chirality plays a central role in chemistry and biology, where molecules of opposite handedness can exhibit strikingly different biological and pharmacological activities despite having identical chemical compositions. Identifying and controlling molecular enantiomers is therefore of major importance. Light provides a natural probe of molecular handedness: chiral molecules interact differently with left- and right-circularly polarized light, giving rise to optical activity and circular dichroism, the foundations of chiroptical spectroscopy. Cavity quantum electrodynamics goes one step further by using confined electromagnetic fields to modify matter itself. Chiral cavities, engineered to interact differently with opposite molecular handedness, could enhance weak chiroptical signals and open new routes toward enantioselective synthesis, a major challenge in the pharmaceutical industry. This internship aims to develop a microscopic quantum model of chiral molecular ensembles strongly coupled to a Fabry-Perot cavity with engineered chiral mirrors. The goal is to understand and optimize chiral light-matter interactions toward ultrasensitive chiroptical spectroscopy and cavity-controlled enantioselective chemistry.