2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209173We provide a simple description of the most general collective Gaussian attack in continuous-variable quantum cryptography. In the scenario of such general attacks, we analyze the asymptotic secret-key rates which are achievable with coherent states, joint measurements of the quadratures and one-way classical communication.4 pages, 1 figure + 1 Table, REVteX. More descriptive titleQuantum PhysicsOpticstext