  Over the last two decades, the scale and complexity of Anonymous networks and
its associated technologies grows exponentially as privacy has become a major
concern of individuals. Also, some cyber attackers make use of privacy
infrastructures including botnets and Tor to do illegal activities like drug,
contraband or DDoS attack. However, anonymous networks are not perfect, there
are some methods could exploit the vulnerabilities and track user information.
In this paper, we analyze few of privacy infrastructures and their
vulnerabilities.
