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STONEGHOST or "Stone Ghost", is a codename for a network operated by the United States' Defense Intelligence Agency (DIA) for information sharing and exchange between the United States, the United Kingdom, Canada and Australia. Other sources say that New Zealand is also participating, and that Stone Ghost therefore connects, and is maintained by the defense intelligence agencies of all Five Eyes countries.
Stone Ghost does not carry Intelink-Top Secret information. It used to be known as Intelink-C and may also be referred to as "Q-Lat" or "Quad link". It is a highly secured network with strict physical and digital security requirements. The network hosts information about military topics, and about SIGINT, foreign intelligence and national security.
2012 Canadian spy case
Royal Canadian Navy intelligence officer Sub-Lt. Jeffrey Delisle pleaded guilty on 10 October 2012 to charges including having downloaded and sold information from the Stone Ghost system to the Russian spy agency GRU. He was sentenced to 20 years in prison, minus time served on February 6, 2013 for contravening the Security of Information Act.