National Security Agency published a book to help its spies uncover intelligence hiding on the web. The book contains instructions on the use of search engines, on line tools and Internet Archive. NSA reserved an entire chapter to instruct its agents on how to use Google Dorks to search for specific files. A proper use of the search engine could allow the collecting of surprising data and help the constructions of a study that is able to cross various sources to conduct complex researches. Google is a mine of information that could be used for various purposes, hacking is one of them.”]
Source: http://securityaffairs.co/wordpress/14277/hacking/google-book-published-nsa-for-cyber-spies.html