The following four use cases for Sony, Target, Citigroup, and Home Depot demonstrate several relationships between repositories that could be further examine and explore to research those attacks in-depth. As in Sony, there was a vulnerability of the PlayMemories Online during the same period of the Sony PlayStation breach. Also, both Sony Pictures and Sony PlayStation were compromised twice during 2011 and 2014. For Target, its Health Plan was recently hacked in 2016 and one of their marketing division was also attacked. Consequently, Citigroup has been breached 6 separate times between 2005 and 2013. Similarly, two laptops were stolen from Home Depot in 2007 as well three employees were arrested for stealing personal information. As
