2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90311We present a crytographic protocol based upon entangled qutrit pairs. We analyse the scheme under a symmetric incoherent attack and plot the region for which the protocol is secure and compare this with the region of violations of certain Bell inequalities.6 pages, 4 figures, REVTEX4Quantum Physicstext