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People who access the internet through the anonymizing Tor network are much more likely to be up to no good than are typical internet users, according to a study by online reputation–tracking firm Iovation.

The company announced on Tuesday that 30.2 per cent of the transactions it logged as coming from the Tor network during the month of August were fraudulent, compared to a 1 per cent fraud rate for internet transactions as a whole.

Tor disguises the source of internet connections by shuttling them through hard-to-follow network routes and assigning them IP addresses at random from a pool distributed around the globe. While it's not too hard to tell whether a connection is coming from Tor, it's extremely difficult to know just who is behind any given connection, or even where in the world they are located.

For that reason, while Tor has often been used for political activism, whistleblowing, and other risky but laudable activities, it is also home to a shady underworld of less-praiseworthy dealings, ranging from drug trafficking to child pornography. The online black market Silk Road conducts its business entirely over Tor.

Online criminals have recently begun experimenting with using Tor as a cover for other kinds of internet traffic, as well. The number of clients accessing the network on a daily basis doubled in August when the Mevade.A botnent began using Tor to route its command and control data.

Little wonder, then, that Iovation found that nearly a third of all Tor transactions were suspect – and the company isn't just talking about sales on Silk Road, either.

"Transactions simply means any online action at one of our customer sites like online purchases, account registrations, credit applications, logins, wire transfers, comments, etc," Scott Olson, Iovation's VP of product, told The Reg via email. "Any interaction where fraud or abuse are of concern to our subscribers."

Iovation's ReputationManager 360 service can't identify individual Tor users, but it can spot traffic that originates from known Tor IP addresses, called "exit nodes." To conduct its study, it analyzed 240 million transactions conducted in August 2013 and compared the fraud rate of Tor traffic to that of the whole.

Iovation is making the ability to identify Tor traffic generally available to its ReputationManager 360 customers at no charge beginning on Tuesday.

"Tor in itself isn't a bad service," Olson told El Reg. "It can be used for positive things as well as fraudulent things. For our clients, they are concerned with mitigating risk and in this case, Tor is disproportionately associated with a much higher fraud rate for online purchases, account applications, logins (through account takeovers), etc."

Iovation isn't the first to identify this problem. As recently as August, the head of Russia's Federal Security Service said he would like to block Tor traffic at the national level as part of the country's anti-terrorism efforts.

Although blocking all Tor traffic would be challenging, blocking traffic that re-enters the mainstream internet via Tor exit nodes is comparatively easy. Wikipedia prevents editing by Tor users, for example, and if Tor's reputation for being rife with bad actors grows, more sites may choose to do the same. ®

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