Home Secretary G K Pillai on Monday said that terrorists are using the Internet as the most potent tool to rope in youths and carry out espionage operations in the country. He said, terrorist attacks like that in Mumbai were facilitated by communications from the handlers over Internet. He said, government is in the process of reviewing and updating the national cyber security strategy to improve data security. Mr Pillai was addressing a conference on the challenge posed by cyber crimes organised by NASSCOM's Data Security Council and Deloitte in Delhi. He said government has formulated a crisis management plan and created a national computer emergency response team CERT-IN which is the national nodal agency in the cyber security and also works with international partners. The Home Secretary also raised the issue of improving cyber security certification system in the country.