On the TV series Stargate SG-1, they envisioned using conventional EMR (like radio and TV signals) through wormhole connections. Later plots faced invasion att

On the TV series Stargate SG-1, they envisioned using conventional EMR (like radio and TV signals) through wormhole connections. Later plots faced invasion attempts through the stargates (permanent, direct-dial wormhole portals), so matter shielding was employed, and signals were used to authenticate who was on the other side of the connection before lowering the shield.