2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93917A simplified eavesdropping-strategy for BB84 protocol in quantum cryptography (refer to quant-ph/9812022) is proposed. This scheme implements by the `indirect copying' technology. Under this scheme, eavesdropper can exactly obtain the exchanged information between the legitimate users without being detected.10 pages, no figuresQuantum Physicstext