Tolong jelaskan mengenai Lambang dari Badan Keamanan Nasional

Lambang NSA terdiri dari elang botak menghadap ke kanan, lambang perdamaian, mencengkeram sebuah kunci pada kukunya, melambangkan cengkeraman NSA pada sistem keamanan dan misinya membongkar dan melindungi rahasia. Elang tersebut berada pada latar belakang biru, dan dadanya berbentuk perisai biru dengan 13 garis merah dan putih, melambangkan warna-warna bendera AS. Pada pinggir lambang, terdapat lingkaran putih dengan tulisan "NATIONAL SECURITY AGENCY" dan "UNITED STATES OF AMERICA", dengan dua bintang di antara kedua tulisan tersebut. Lambang ini mulai digunakan sejak 1965, saat Direktur NSA Marshall Carter memerintahkan pembuatan lambang NSA.

Levy, Steven, Crypto: How the Code Rebels Beat the Government Saving Privacy in the Digital Age — discussion of the development of non-government cryptography, including many accounts of tussles with the NSA.

Radden Keefe, Patrick, Chatter: Dispatches from the Secret World of Global Eavesdropping, Random House, ISBN 1-4000-6034-6.

Liston, Robert A., The Pueblo Surrender: a Covert Action by the National Security Agency, ISBN 0-87131-554-8.

Kahn, David, The Codebreakers, 1181 pp., ISBN 0-684-83130-9. Look for the 1967 rather than the 1996 edition.

Tully, Andrew, The Super Spies: More Secret, More Powerful than the CIA, 1969, LC 71080912.

Bamford, James, New York Times, December 25, 2005; The Agency That Could Be Big Brother.

Sam Adams, War of numbers Steerforth; New Ed edition (June 1, 1998)

John Prados, The Soviet estimate: U.S. intelligence analysis & Russian military strength, hardcover, 367 pages, ISBN 0-385-27211-1, Dial Press (1982).

Walter Laquer, A World of secrets

Sherman Kent, Strategic Intelligence for American Public Policy

David Alan Jordan, Decrypting the Fourth Amendment: Warrantless NSA Surveillance and the Enhanced Expectation of Privacy Provided by Encrypted Voice over Internet Protocol  - Boston College Law Review, Vol. 47, 2006