2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111104This paper modifies Kak's three-stage protocol so that it can guarantee secure transmission of information. Although avoiding man-in-the-middle attack is our primary objective in the introduction of classical authentication inside the three-stage protocol, we also benefit from the inherent advantages of the chosen classical authentication protocol. We have tried to implement ideas like key distribution center, session key, time-stamp, and nonce, within the quantum cryptography protocol.7 pages, 3 figuresCryptography and Securitytext