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How often should you change social media passwords? 

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Analysis of the passwords generated by a group of volunteers and their ability to recall multiple passwords at later moments in time show that one can actually achieve good memorability of strong and unique passwords.
We find large variance in participants' understanding of how passwords may be attacked, potentially explaining why users nonetheless make predictable passwords.
This trend is more pronounced for long and complex passwords as opposed to short dictionary based passwords.
These patterns indicate that more research is needed to determine how social media users differentiate between normative, heavy, and addicted usage.
The study suggests that reducing cognitive costs for passwords is imperative.
Open accessJournal ArticleDOI
Cormac Herley, P. C. van Oorschot 
01 Jan 2012
287 Citations
The authors also highlight the need for more systematic research and how the premature conclusion that passwords are dead has led to the neglect of important research questions.