Hummingbird: Privacy at the time of Twitter. - Emiliano De Cristofaro; Claudio Soriente; Gene Tsudik; Andrew Williams 003 (IACR Cryptol. ePrint Arch., 2011)

Tweeting with Hummingbird: Privacy in Large-Scale Micro-Blogging OSNs. - Emiliano De Cristofaro; Claudio Soriente; Gene Tsudik; Andrew Williams 003 (IEEE Data Eng. Bull., 2012)