Hackers build a new Tor client designed to beat the NSA (may 2015)
http://www.dailydot.com/politics/tor-astoria-timing-attack-client/
and for the pro's:
http://arxiv.org/pdf/1505.05173.pdf
http://www.dailydot.com/politics/tor-astoria-timing-attack-client/
and for the pro's:
http://arxiv.org/pdf/1505.05173.pdf