The agency has circumvented or cracked much of the encryption, or
digital scrambling, that guards global commerce and banking systems,
protects sensitive data like trade secrets and medical records, and
automatically secures the e-mails, Web searches, Internet chats and
phone calls of Americans and others around the world, the documents
show.
Many users assume — or have been assured by Internet companies — that
their data is safe from prying eyes, including those of the government,
and the N.S.A. wants to keep it that way. The agency treats its recent
successes in deciphering protected information as among its most closely
guarded secrets, restricted to those cleared for a highly classified
program code-named Bullrun, according to the documents, provided by
Edward J. Snowden, the former N.S.A. contractor.
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