Following the security advisory issued by TOR stating that a group of relays were discovered in early July seemingly trying to deanonymize users, Jaime Blasco, director of AlienVault Labs, says:
“TOR provides anonymity, if you want to have privacy you still have to use something like a VPN in order to connect to the TOR network. You are still facing other problems like tracking and profiling or unauthorized access to your system using exploitation of the browser or any other software you are using over the TOR network. As an example the FBI used an exploit affecting Firefox to deanonymize TOR users accessing illegal content.
On the other hand, governments are actively investing a huge amount of money and resources in order to compromise the TOR network. If you want to be secure you should assume TOR is compromised and use other methods to maintain your anonymity and privacy within TOR.”