Unintended Risks and Consequences of Circumvention Technologies: The IBB's Anonymizer Service in Iran

ONI testing found that filters built in to the IBB Anonymizer service block access to numerous non-pornographic pages and sites. Some of these apparently unintentionally blocked sites are themselves blocked within Iran, resulting in a situation where sites are effectively doubly blocked --by Iranian ISPs and by the IBB Anonymizer service. Further, despite IBB Anonymizer assurances that its Iranian users may surf the Web freely and safely, our testing suggests that the vast majority of its traffic is exposed to monitoring by Iranian authorities and corresponding local ISPs. Click Here to read the full advisory.