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NSA cryptography
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<p>The vast majority of the <a href="/facts/National_Security_Agency/Sg6MGV1o">National Security Agency</a>'s work on <a href="/facts/Cryptography/e94PEVau">encryption</a> is <a href="/facts/Classified_information/og7wn3tD">classified</a>, but from time to time NSA participates in <a href="/facts/Standardization/vS9AhNMS">standards</a> processes or otherwise publishes information about its cryptographic algorithms. The NSA has categorized encryption items into four product types, and algorithms into two suites. The following is a brief and incomplete summary of public knowledge about NSA algorithms and protocols. </p>