There are some more technical details in the extended blog post – https://www.benthamsgaze.org/2016/08/02/do-you-know-what-youre-paying-for-how-contactless-card

There are some more technical details in the extended blog post – https://www.benthamsgaze.org/2016/08/02/do-you-know-what-youre-paying-for-how-contactless-cards-are-still-vulnerable-to-relay-attack/ https://www.benthamsgaze.org/2016/08/02/do-you-know-what-you...