document: Anti-aliasing on the web It is increasingly common for users to interact with the web using a number of different aliases . This trend is a double-edged sword . On one hand , it is a fundamental building block in approaches to online privacy . On the other hand , there are economic and social consequences to allowing each user an arbitrary number of free aliases . Thus , there is great interest in understanding the fundamental issues in obscuring the identities behind aliases . However , most work in the area has focused on linking aliases through analysis of lower-level properties of interactions such as network routes . We show that aliases that actively post text on the web can be linked together through analysis of that text . We study a large number of users posting on bulletin boards , and develop algorithms to anti-alias those users : we can with a high degree of success identify when two aliases belong to the same individual . Our results show that such techniques are surprisingly effective , leading us to conclude that guaranteeing privacy among aliases that post actively requires mechanisms that do not yet exist .
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