000			00947nam a2200205 a 4500
005			20140414132102.0
008			100722s19uu xx 00 eng d
020			_a9781595665942
050			_aM 652.8 _bG54 2008
100			_aGilbert, Adrian
245			_aCodes and ciphers.
260			_aLondon : _bQED, _c2008.
300			_a32 p.
440			_aSpy files
500			_aContents: Codes and ciphers -- The Caesar cipher -- Code breaking -- Morse code -- Visual codes -- Navajo code talkers -- One-time pads -- Cipher machines -- Purple intelligence -- Enigma -- Secret writing -- Microdots -- Radio communications. Notes: Includes index.
520			_a"Discusses the difference between codes and ciphers, common codes and ciphers that have been used during wars, and how to create simple ciphers"--Provided by publisher.
650			_aCiphers --Juvenile literature.
650			_aCryptography --Juvenile literature.
999			_c114501 _d114501