Even as the hunt continues for suspects in the Paris terror bombings, some Western intelligence officials have already identified their culprit: Edward Snowden.

London Mayor Boris Johnson says the former National Security Agency contractor, who two years ago outed the U.S. government's program of telephone and Internet surveillance, effectively taught terrorists "how to avoid being caught." CIA Director John Brennan complained Monday that "a number of unauthorized disclosures" in recent years about the extent of federal snooping has made tracking terrorists "much more challenging." Snowden also drew a borderline-profane slam on Twitter over the weekend from former George W. Bush press secretary Dana Perino.

No evidence has surfaced yet that Snowden's revelations made a difference in this case, or that the perpetrators of Friday's attacks used encrypted communications to conceal their activities. Many private-sector computer specialists surveyed by POLITICO were skeptical about those arguments, which if true would mesh with more than a year of warnings from intelligence officials about the growing ability of terrorists and criminals to hide their tracks online.