Computer systems ease the sharing and use of information,but accessibility of information leads to privacy concerns.Technology is being developed to address this issue - enablinguse of information while controlling the disclosure. But isthis enough to protect privacy? How do we even know if it isenough? This talk will survey recent developments in privacyand anonymity technology, emphasizing the variety of privacydefinitions, their benefits, and their weaknesses. About the speaker: http://www.cs.purdue.edu/people/clifton