2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/172115We propose quantum cryptographic protocols to secretly communicate a reference frame- unspeakable information in the sense it cannot be encoded into a string of bits. Two distant parties can secretly align their Cartesian axes by exchanging N spin 1/2 particles, achieving the optimal accuracy 1/N. A possible eavesdropper cannot gain any information without being detected.4 pages, no figures; published versionQuantum Physicstext