disrupt iranian 's nuclear program ref name us ref although neither publicly admitted global surveillance disclosures early documents provided edward snowden published ''the washington post'' ''the guardian'' ref name ardinterview ref exposing massive scale nsa global surveillance also indications nsa may inserted backdoor nist standard encryption standard later withdrawn due widespread criticism ref name nist abandonment ref nsa additionally revealed tapped links google 's data centers target home depot breaches ukrainian hacker known rescator broke
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