"The internet has enabled an unprecedented ability to monitor and track people and information flows as highlighted in the 2013 revelations by Edward Snowden about online surveillance carried out by the United States’ National Security Agency. The revelations have kicked off debates across the world about the correct balance between citizen privacy and national security in the context of the internet. In the face of this shifting landscape it is critical for human rights activists to understand how internet surveillance works, and what privacy and anonymity really mean in a digital world." (Back cover)