That use of the word "Myrtus" -- which can be read as an allusion to Esther -- to name a file inside the code is one of several murky clues that have emerged as computer experts try to trace the origin and purpose of the rogue Stuxnet program, which seeks out a specific kind of command module for industrial equipment.
Not surprisingly, the Israelis are not saying whether Stuxnet has any connection to the secretive cyberwar unit it has built inside Israel's intelligence service. Nor is the Obama administration, which while talking about cyberdefenses has also rapidly ramped up a broad covert program, inherited from the Bush administration, to undermine Iran's nuclear program. In interviews in several countries, experts in both cyberwar and nuclear enrichment technology say the Stuxnet mystery may never be solved.
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