Flash Cookies and Privacy | Search for a title, author or keyword | ||||||||
Flash Cookies and Privacy by Ashkan Soltani, Shannon Canty, Quentin Mayo, Lauren Thomas, Chris Jay Hoofnagle. School of Information, Summer Undergraduate Program in Engineering Research at Berkeley (SUPERB) 2009, UC Berkeley School of Law, University of California, Berkeley, Berkeley, USA. This is a pilot study of the use of “Flash cookies” by popular websites. We find that more than 50% of the sites in our sample are using Flash cookies to store information about the user. Some are using it to “respawn” or re-instantiate HTTP cookies deleted by the user. Flash cookies often share the same values as HTTP cookies, and are even used on government websites to assign unique values to users. Privacy policies rarely disclose the presence of Flash cookies, and user controls for effectuating privacy preferences are lacking.
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