Study Publisher: Troy Hunt
Study Date: July 12 2012
Study URL: http://www.troyhunt.com/2012/07/what-do-sony-and-yahoo-have-in-common.html

Study Overview:
Analyzed data from the SonyPictures.com plaintext password dump from June 2011 containing around 37,608 accounts, and the Yahoo! Voices plaintext password dump from July 2012 containing around 453,491 accounts. Compared passwords of 302 matching account names.

Statistics From This Study:

• Actual password reuse between two breached web sites with plaintext passwords