Repeater attacks can be mitigated by putting a time limit for a response from the device used as the key (e.g. phone). That's how a lot of contactless payment t

Repeater attacks can be mitigated by putting a time limit for a response from the device used as the key (e.g. phone). That's how a lot of contactless payment terminals ensure the physical credit card is in proximity of the reader and someone isn't relaying the responses across the country.