The circumstantial evidence is impressive. Just one question: Why would China do it?
China has an intimate knowledge of Iran’s centrifuges since, according to one source quoted above, they’re of Chinese design.That’s four pieces of evidence. Read the whole story and you’ll see that there’s more; plus, and needless to say, when it comes to cyberwar hijinks in the past few years, the Chinese are usually a safe bet as the culprits. More at:
China has better access than any other country to manufacturing plans for the Vacon frequency converter drive made by Vacon’s Suzhou facility and specifically targeted by the Stuxnet worm (along with an Iranian company’s drive). Furthermore, in March 2010, China’s Customs ministry started an audit at Vacon’s Suzhou facility and took two employees into custody thereby providing further access to Vacon’s manufacturing specifications under cover of an active investigation.
China has better access than any other country to RealTek’s digital certificates through it’s Realsil office in Suzhou and, secondarily, to JMicron’s office in Taiwan.
China has direct access to Windows source code, which would explain how a malware team could create 4 key zero day vulnerabilities for Windows when most hackers find it challenging to develop even one.