IBM says Block Tor

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http://public.dhe.ibm.com/common/ssi/ecm/wg/en/wgl03086usen/WGL03086USEN.PDF

IBM Advises Businesses To Block Tor

With Tor-based attacks on the rise, IBM says it's time to stop Tor in
the enterprise.

New data from IBM's X-Force research team shows steady increase in SQL
injection and distributed denial-of-service attacks as well as
vulnerability reconnaissance activity via the Tor anonymizing service.