DNC hack highlights uncertainties over government-private sector roles

The hacking of Democratic National Committee emails, allegedly by Russia, is causing headaches for the party as its convention opens in Philadelphia, but it also points to ongoing uncertainties about government and private-sector roles in defending cyberspace.

And, if Russia is ultimately identified as the culprit, the episode could invigorate congressional and other critics who say the Obama administration lacks a credible cyber deterrence policy.

Sen. Tim Kaine (D-VA), presidential nominee Hillary Clinton's vice presidential running mate, in May said...