Major scandal: How "NATO secret" was revealed

The data includes blueprints for weapons used by NATO allies in the conflict in Ukraine, and hackers were selling them online after stealing data from a major European arms manufacturer, MBDA Missile Systems, according to the BBC.
MBDA Missile Systems admitted its data was among the stash but claimed none of the classified files belong to the firm.
The pan-European company, which is headquartered in France, said its information was hacked from a compromised external hard drive, adding that it was cooperating with authorities in Italy, where the data breach took place.
In a statement, a NATO spokesperson said: "We are assessing claims relating to data allegedly stolen from MBDA. We have no indication that any NATO network has been compromised."
Cyber criminals, operating on Russian and English forums, are selling 80GB of the stolen data for 15 Bitcoins (approximately £18.000) and claimed to have sold the stash to at least one unknown buyer so far, BBC specifies.

EPA-EFE/TOMS KALNINS

In their advert for the stolen data, the hackers claimed to have "classified information about employees of companies that took part in the development of closed military projects" as well as "design documentation, drawings, presentations, video and photo materials, contract agreements and correspondence with other companies".
A free 50MB sample of the data, seen by the BBC, includes documents labelled "NATO CONFIDENTIAL", "NATO RESTRICTED" and "Unclassified Controlled Information".
In addition to the sample, the criminals supplied additional documents by email, including two marked "NATO SECRET", BBC claims.
The hackers would not confirm whether or not the material had come from more than one hacked source.
The files, which the BBC...