Here is the article I read about this issue: http://grugq.github.io/blog/2013/03/12/anonymity-is-hard/ http://grugq.github.io/blog/2013/03/12/anonymity-is-hard/

Here is the article I read about this issue: http://grugq.github.io/blog/2013/03/12/anonymity-is-hard/ http://grugq.github.io/blog/2013/03/12/anonymity-is-hard/ "Hiding anomalous activity is hard, but vitally important. The problem with many security systems based purely on secrecy is that their usage is itself anomalous. It singles out and attracts attention to the users. If the adversary doesn’t know who those users are initially, they can cross correlate real world data with the suspicious activity and narrow their focus to real people."