To date, the only public evidence that the Russian government was responsible for hacks of the DNC and key Democratic figures has been circumstantial and far short of conclusive, courtesy of private research firms with a financial stake in such claims. Multiple federal agencies now claim certainty about the Kremlin connection, but they have yet to make public the basis for their beliefs.
Now, a never-before-published top-secret document provided by whistleblower Edward Snowden suggests the NSA has a way of collecting evidence of Russian hacks, because the agency tracked a similar hack before in the case of a prominent Russian journalist, who was also a U.S. citizen.
In 2006, longtime Kremlin critic Anna Politkovskaya was gunned down in her apartment, the victim of an apparent contract killing. Although five individuals, including the gunman, were convicted for the crime, whoever ordered the murder remains unknown. Information about Politkovskaya’s journalism career, murder, and the investigation of that crime was compiled by the NSA in the form of an internal wiki entry. Most of the wiki’s information is biographical, public, and unclassified, save for a brief passage marked top secret.