Software which was designed to help Iranians escape government control of the web has been withdrawn over fears that it was too easy to hack. Haystack was designed to help people in the country communicate via the web without revealing who they were.
However Haystack's creators have admitted that they had little control over who was using the software and it could be vulnerable to attacks that limited its effectiveness to mask a user's location or identity.
Iindependent computer expert Jacob Appelbaum said on Twitter that it was the "worst piece of software" he had ever investigated and that he was "concerned for the people using it in Iran".
Security fears
Nick Farell
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