The only biometric technology which does not measure the visual features of the human body. In voice recognition the sound vibrations of a person is measured and compared to an existing sample. The person to be identified is usually required to pronounce a designated password or phrase which facilitates the verification process. Voice recognition can be used on the phone, but has the weakness of technology is its susceptibility to interference by background noise.
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U.S. intelligence agency within the Department of Defense that is responsible for cryptographic and communications intelligence and security. The NSA grew out of the communications intelligence activities of U.S. military units during World War II. The NSA was established in 1952 by a presidential directive and, not being a creation of the Congress, is relatively immune to Congressional review; it is the most secret of all U.S. intelligence agencies. The agency's mission includes the protection and formulation of codes, ciphers, and other cryptology for the U.S. military and other government agencies, as well as the interception, analysis, and solution of coded transmissions by electronic or other means. The agency conducts research into all forms of electronic transmission. It operates posts for the interception of signals around the world. Being a target of the highest priority for penetration by hostile intelligence services, the NSA maintains no contact with the public or the press.