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NSA discovered huge 2016 data breach after a tip from barred Russian firm

Jan 10, 2019 - The Washington Post

Kaspersky Lab notified agency about odd Twitter messages from suspect

The National Security Agency discovered what has been called the largest breach of classified data in its history in 2016 after getting a tip from a Russian cybersecurity firm that the U.S. government has banned from its networks as a spy threat, according to people familiar with the matter.

Federal prosecutors in August 2016 arrested a former NSA contractor, Harold T. Martin III, accusing him of taking home withou...