Editor´s note

For the IEEE Network 2013 January/February issue, in addition to the Special Issue on Cyber Security of Networked Critical Infrastructures, we also include five accepted open call articles as follows. Participatory sensing is an emerging computing paradigm that enables the distributed collection of data by self-selected participants. The first article, "Participatory Privacy: Enabling Privacy in Participatory Sensing" by Emiliano De Cristofaro and Claudio Soriente, focuses on privacy issues in participatory sensing and proposes a simple privacy-enhanced infrastructure. It also provides a set of clear definitions geared to protecting the privacy of both data producers and consumers.