Lockheed Network Suffers Major Disruption: Sources

According to the report (which cites Robert Cringely), the intrusion technique involved SecurID tokens:

The slowdown began on Sunday after security experts for the company detected an intrusion to the network, according to technology blogger Robert Cringely. He said it involved the use of SecurID tokens that employees use to access Lockheed's internal network from outside its firewall.