Experts in Argentina are recommending car owners wrap their key fobs in aluminum foil to help prevent relay attacks, a growing method of vehicle theft. This technique blocks the signal emitted by keyless entry systems, making it harder for thieves to unlock and start the car. Relay attacks involve criminals using devices to amplify the fob’s signal, even when it’s inside the house, allowing them to remotely access the vehicle. While effective, the aluminum foil method isn’t foolproof, as sophisticated thieves may still find ways to bypass the protection. Authorities in Córdoba province, Argentina, have seen an increase in these types of thefts. The method serves as a low-cost, temporary solution while automakers work on more secure systems and owners consider additional security measures such as faraday bags.