The Associated Press reports that after Clinton’s 30,000 work-related emails were turned over to the State Department, 47 of them were marked with the notation “B3 CIA PERS/ORG” to justify why certain passages were redacted.
Stewart Baker, a former assistant secretary of the Homeland Security Department and a former NSA legal counsel, says, “Start with the entirely plausible view that foreign intelligence services discovered and rifled Hillary Clinton’s server.” Then those agencies could compare the full emails with the redacted versions and use the B3 CIA markings to find the meaning of names that otherwise might not be obvious. Baker says, “Presto—the CIA names just fall off the page.”
An unnamed US official says the risk of the names of CIA personnel being revealed in this way is “theoretical,” since it is unknown if other governments hacked Clinton’s server to get their own full versions of the emails. (The Associated Press, 6/8/2016)