A top US university has denied the accuracy of claims that it accepted $1m from the FBI to help it attack the widely-used anonymising network Tor.
A senior director at Tor - a service people can use to gain a higher level of privacy online - claimed that Carnegie Mellon University had accepted a seven-figure sum from the FBI.
An attack on Tor was launched early last year and lasted six months, and involved the use of malicious nodes on the network.
Tor’s director Roger Dingledine wrote in a post last week that university "researchers were paid by the FBI to attack hidden services users in a broad sweep, and then sift through their data to find people whom they could accuse of crimes".
However, in a carefully written statement Carnegie Mellon University it questioned the 'accuracy' of reports that it accepted payment from the FBI.
It said that it occasionally receives subpoenas for its researchers' work and has to turn such work over by law.
The school said: "In the course of its work, the university from time to time is served with subpoenas requesting information about research it has performed.
"The university abides by the rule of law, complies with lawfully issued subpoenas and receives no funding for its compliance."
Tor consists of volunteer relays that users move between to hide their real IP address, which can be used to identify users.
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