Small changes to abstract and intro

\begin{abstract}

We present Tor, a connection-based low-latency anonymous communication

system which addresses many limitations in the original onion routing design.

system. It is intended as an update and replacement for onion routing

and addresses many limitations in the original onion routing design.

Tor works in a real-world Internet environment,

requires little synchronization or coordination between nodes, and

protects against known anonymity-breaking attacks as well

at each node, revealing the downstream node. The original onion routing

project published several design and analysis papers

\cite{or-jsac98,or-discex00,or-ih96,or-pet02}. While there was briefly

a network of about a dozen nodes at three widely distributed sites,

a wide area onion routing network,

the only long-running and publicly accessible

implementation was a fragile proof-of-concept that ran on a single

machine. Many critical design and deployment issues were never implemented,

  acknowledge its existence.

\SubSubSection{Integration with user applications}

\subsubsection{Integration with user applications}

\Section{Maintaining anonymity sets}

\label{sec:maintaining-anonymity}