High Quality Content by WIKIPEDIA articles! Dan Kaminsky is an American security researcher. He formerly worked for Cisco, Avaya, and IOActive, where he was the Director of Penetration Testing. He is known among computer security experts for his work on DNS cache poisoning (also known as "The Kaminsky Bug"), and for showing that the Sony Rootkit had infected at least 568,200 computers and for his talks at the Black Hat Briefings.