https://www.theregister.co.uk/2019/12/16/internet_of_crap_encryption/ > A preponderance of weak keys is leaving IoT devices at risk of being hacked, and the problem won't be an easy one to solve. > This was the conclusion reached by the team at security house Keyfactor, which analyzed a collection of 75 million RSA certificates gathered from the open internet and determined that number combinations were being repeated at a far greater rate than they should, meaning encrypted connections could possibly be broken by attackers who correctly guess a key.