There are many reasons to suspect Israel’s involvement in Stuxnet. Intelligence is the single largest section of its military and the unit devoted to signal, electronic and computer network intelligence, known as Unit 8200, is the largest group within intelligence.
Yossi Melman, who covers intelligence for the newspaper Haaretz and is at work on a book about Israeli intelligence over the past decade, said in a telephone interview that he suspected that Israel was involved.
He noted that Meir Dagan, head of Mossad, had his term extended last year partly because he was said to be involved in important projects. He added that in the past year Israeli estimates of when Iran will have a nuclear weapon had been extended to 2014.
“They seem to know something, that they have more time than originally thought,” he said.