The Caeser cipher (system for substituting letters to encode some text) is a shift cipher, where each letter is substituted for a letter a fixed number of spaces away in the alphabet. This cipher was used by Julius Caeser but can be broken relatively easily.
Cryptography is the science of using secret codes. Many types of systems have been used. A famous one is the Enigma, used by the Germans during World War II. Complex systems have been developed, such as RSA, to protect information sent over the internet.
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