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Researchers figured out how to break the encryption in the older Model S key fobs using about $600 in equipment. Cars and key fobs made since June 2018 aren't vulnerable to this exploit. For more information take a look at https://www.wired.com/story/hackers-steal-tesla-model-s-seconds-key-fob.
Upon reflection, Tesla should replace all the older, 40 bit encryption key fobs for free and charge their supplier for failure to use best practices for computer security in their products. 40 bit encryption has been known to be vulnerable to very rapid brute force attacks for well over a decade. If I had one of these vulnerable key fobs I would be talking to a lawyer for a class action naming the supplier as the primary defendant and Tesla as the co-defendant.
Upon reflection, Tesla should replace all the older, 40 bit encryption key fobs for free and charge their supplier for failure to use best practices for computer security in their products. 40 bit encryption has been known to be vulnerable to very rapid brute force attacks for well over a decade. If I had one of these vulnerable key fobs I would be talking to a lawyer for a class action naming the supplier as the primary defendant and Tesla as the co-defendant.