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In this paper we introduce a system called Crowds for protecting users' anonymity on the worldwide-web. Crowds, named for the notion of "blending into a crowd", operates by grouping users into a large and geographically diverse group (crowd) that collectively issues requests on behalf of its members. Web servers are unable to learn the true source of a request because it is equally likely to have originated from any member of the crowd, and even collaborating crowd members cannot distinguishdoi:10.1145/290163.290168 fatcat:i4ewx2tktnbk3n7atzzkjtyr64