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Baris 7: === Peran === [[Berkas:National Security Agency headquarters, Fort Meade, Maryland.jpg\|thumbnail\|225px\|right\|Markas besar NSA di [[Fort Meade]], [[Maryland]]]] Kegiatan-kegiatan NSA meliputi [[penyadapan]] dan [[pengamanan]]. Penyadapan NSA meliputi [[telepon]], komunikasi [[~~internet~~Internet]], komunikasi [[radio]], serta komunikasi-komunikasi lainnya yang dapat disadap. Pengamanan NSA meliputi komunikasi [[militer]], [[diplomasi\|diplomatik]], serta komunikasi-komunikasi rahasia atau sensitif pemerintah. NSA merupakan organisasi yang mempekerjakan [[ahli matematika]] dan memiliki [[superkomputer]] terbanyak di dunia.<ref>[http://www.nsa.gov/about/ Introduction to NSA/CSS], NSA. Retrieved 15 May 2006.</ref> Namun NSA berusaha untuk tetap ''[[low profile]]'', bahkan Pemerintah AS pernah tidak mengakui keberadaannya selama beberapa tahun. Karena itu, NSA sering dipelesetkan sebagai ''No Such Agency'' (Tidak ada agensi seperti itu), atau ''Never Say Anything'' (Jangan bilang apa-apa). Karena tugasnya mengumpulkan informasi, termasuk informasi rahasia, maka NSA juga terlibat dalam penelitian [[kriptoanalisis]], pemecahan [[sandi]] dan [[kode (kriptografi)\|kode]]. Pendahulu NSA seperti ''[[Purple Code]]'', ''[[Venona]]'', dan ''[[JN-25]]'' sendiri telah berhasil memecahkan [[kriptografi pada Perang Dunia II\|banyak sandi]] pada [[Perang Dunia II]]. Baris 69: }}</ref> Technically, almost all modern telephone, ~~internet~~Internet, fax and satellite communications are exploitable due to recent advances in technology and the 'open air' nature of much of the radio communications around the world. The NSA's presumed collection operations have generated much criticism, possibly stemming from the assumption that the NSA/CSS represents an infringement of Americans' [[privacy]].{{Fact\|date=August 2007}} However, the NSA's [[United States Signals Intelligence Directive 18]] (USSID 18) strictly prohibits the interception or collection of information about "...US persons, entities, corporations or organizations..." without explicit written legal permission from the [[Attorney General]] of the United States <ref name="USSID18">National Security Agency. [http://cryptome.org/nsa-ussid18.htm United States Signals Intelligence Directive 18]. National Security Agency [[July 27]], [[1993]]. Last access date [[March 23]], [[2007]]</ref> The [[US Supreme Court]] has ruled that intelligence agencies cannot conduct surveillance against American citizens. There are a few extreme circumstances where collecting on a US entity is allowed without a USSID 18 waiver, such as with civilian distress signals, or sudden emergencies such as [[September 11, 2001 attacks\|9/11]]; however, the [[USA PATRIOT Act]] has significantly changed privacy legality.

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