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NSA encryption systems
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=== Field authentication === [[File:KAL-55B Tactical Authentication System (Vietnam War era) - National Cryptologic Museum - DSC08013.JPG|thumb|NSA KAL-55B Tactical Authentication System used during the [[Vietnam War]] β [[National Cryptologic Museum]]]] NSA still supports simple paper encryption and authentication systems for field use such as [[DRYAD]].
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