In any discussion of the vulnerability of your computer to malware, the discussion is often centered around the cutting edge of the battles between new threats and new versions of browsers and software to combat them. But the dirty little secret we don’t discuss much is: Most software is older than dirt. Does software need a fresh sale date? Security researchers are beginning to think so.In a newly published paper, Stefan Frei and Martin May of the Computer Engineering and Networks Laboratory at ETH Zurich,