2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230777This note describes some cryptographic issues related to multi-located parties. In general, multi-located parties make it difficult for the eavesdropper to mount the man-in-the-middle attack. Conversely, they make it easier to address problems such as joint encryption and error correction coding. It is easier to implement the three-stage quantum cryptography protocol.7 pages; 6 figuresCryptography and SecurityQuantum Physicstext