(REUTERS) — Apple Inc has never worked with the U.S. National Security Agency and is unaware of efforts to target its smartphones, the company said in response to reports that the spy agency had developed a system to hack into and monitor iPhones.

Germany’s Der Spiegel reported this week that a secretive unit of the NSA, which is under fire for the extent and depth of its spying programs around the world, makes specialized gear and software to infiltrate and monitor a plethora of computing devices, including mobile phones.

The report included an NSA graphic dated 2008 that outlined a system in development called DROPOUTJEEP, described as a “software implant” that allows infiltrators to push and pull and retrieve data from iPhones such as contact lists. Der Spiegel referred to it as a “trojan,” or malware that helps hackers get into protected systems.

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