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   2. Hammond, Andrew. MagiQ. [Online] Available at: http://www.magiqtech.com/press/Magiq_Navajo_Launch. pdf, May 11, 2004.
   3. Kahn, David. “The Codebreakers”. Macmillan, 1967. Nickels, Ian. Informal in-person interviews conducted in May 2004 at SRJC.
   4. The European Information Society Group. “Briefing 16 Anne. 1: What is Cryptography?”