The co-creator of a system designed to make internet users unidentifiable says he is tackling a "bug" that threatened to undermine the facility.
The Tor (the onion router) network was built to allow people to visit webpages without being tracked and to publish sites whose contents would not show up in search engines.
Earlier this month two researchers announced plans to reveal a way to de-anonymise users of this "dark web".
They were later prevented from talking.
http://www.bbc.co.uk/news/technology-28447023
