A ransomware attack on Apple’s main manufacturing partner Foxconn has thrust the world’s most secretive technology supply chain back into the headlines, after hackers claimed they had stolen confidential Apple project files from several North American factories - a reminder to Silicon Valley that even the most polished brands can suffer a digital banana skin. Foxconn, the Taiwan-based electronics giant best known for assembling Apple devices, confirmed through UK-based tech and security publication The Register this week that parts of its US operations were hit by a cyberattack.

The incident followed claims by a ransomware group calling itself Nitrogen that it had taken about 8 terabytes of data, or more than 11 million files, including technical documents linked to Apple and other global technology firms.

Foxconn said production had resumed and that countermeasures were swiftly activated, in what has become a familiar three-step dance in the cyber era: deny, contain and carry on.

For Apple, whose future gadgets are guarded with the secrecy of a diplomatic pouch, the allegations are uncomfortable, if not yet disastrous. Security specialists who examined sample files released by the hackers said the material appeared to include internal engineering papers, financial records and technical drawings tied to Foxconn projects, but did not clearly show sensitive Apple consumer designs.