Email exchange between Edward Snowden and former GOP Senator Gordon Humphrey
(July 2013)
▻https://www.theguardian.com/commentisfree/2013/jul/16/gordon-humphrey-email-edward-snowden
Snowden:
Further, no intelligence service - not even our own - has the capacity to compromise the secrets I continue to protect. While it has not been reported in the media, one of my specializations was to teach our people at DIA [Defense Intelligence Agency] how to keep such information from being compromised even in the highest threat counter-intelligence environments (i.e. China).
You may rest easy knowing I cannot be coerced into revealing that information, even under torture.