In case you’re not a WSJ subscriber: https://archive.is/d8LTZ
https://techcrunch.com/2017/10/03/yahoo-says-all-3b-accounts-were-impacted-by-2013-breach-not-1b-as-thought/ also has a good article on this
https://techcrunch.com/2017/10/03/yahoo-says-all-3b-accounts-were-impacted-by-2013-breach-not-1b-as-thought/ also has a good article on this