Internet Filtering Worldwide:

The Technologies of Filtering and
Their Unanticipated Consequences

Agenda

Country-based filtering

What China targets for blocking

Filtering technologies

DNS Redirection Examples

Granularity of blocking

Granularity of blocking

The effect of technical happenstance on filtering granularity

The effect of technical happenstance on filtering granularity

Selected filtering “mistakes”

Transparency of the block list

Approaches to transparency

Approaches to transparency

The effect of technical happenstance on filtering transparency

The effect of technical happenstance on filtering transparency

Internet Filtering Worldwide:

The Technologies of Filtering and
Their Unanticipated Consequences

Research, articles, listings of specific blocked sites:
http://cyber.law.harvard.edu/filtering