A solo Iranian hacker on Saturday claimed responsibility for stealing SSL certificates belonging to some of the Web’s biggest sites, including Google, Microsoft, Skype and Yahoo. Security experts believe the hacker’s claim, while others are dubious. Last week, conjecture had focused on a state-sponsored attack, perhaps funded or conducted by the Iranian government. CEO Melih Abdulhayoglu said last week that circumstantial evidence pointed to state-backed attack, and claimed Iranian government was probably behind it. He based his opinion on the fact that only Iran’s government would benefit from the stolen certificates.”]