How NSA is infiltrating private networks

The National Security Agency (NSA), working with its British counterpart, the Government Communications Headquarters (GCHQ), secretly tapped into the internal networks of Yahoo! and Google, the two biggest internet companies by overall data traffic. The operation intercepts information flowing between the enormous data centres that those companies maintain around the world. In general, Google and Yahoo! use privately-owned or leased lines to synchronise their data centres. A look at how NSA and GCHQ break into those internal networks