Hacker-Friendly Search Engine that Lists Every Internet-Connected Device

Meet an all-new Hacker’s Search Engine similar to Shodan – Censys.
At the end of last month, security researchers from SEC Consult found that the lazy manufacturers of home routers and Internet of Things (IoT) devices have been re-using the same set of hard-coded cryptographic keys, leaving around 3 millions of IoT devices open to mass hijacking.
But how did the researchers get this number?