Commentary: Don't be so sure Russia hacked the Clinton emails

Russian President Vladimir Putin (C), Defense Minister Sergei Shoigu (L) and Russia's Federal Security Service (FSB) Director Alexander Bortnikov watch events to mark Victory Day in Sevastopol

Last summer, cyber investigators plowing through the thousands of leaked emails from the Democratic National Committee uncovered a clue.

A user named “?????? ??????????” modified one of the documents using settings in the Russian language. Translated, his name was Felix Edmundovich, a pseudonym referring to Felix Edmundovich Dzerzhinsky, the chief of the Soviet Union’s first secret-police organization, the Cheka.