Before joining UCL I was a researcher at Microsoft Research Cambridge from 2007 to 2013. Between 2005 and 2007 I was a post-doctoral visiting fellow at Prof. Bart Preneel's COSIC group at K.U.Leuven, Belgium. With Claudia Diaz we were coordinating the COSIC Privacy Group. Until 2005 I was a research assistant in the Security Group, of the Computer Laboratory of the University of Cambridge, working on anonymous communications, peer-to-peer networks and censorship resistance where I got my Ph.D under the supervision of Prof. Ross J. Anderson, in the security group. My doctoral thesis entitled Better Anonymous Communications and the associated technical report Designing and Attacking Anonymous Communication Systems (UCAM-CL-TR-594) are available. I received my B.A. (Hons) in Computer Science from Queens' College, where I am a foundation scholar.