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Code Breaking Background In classic cryptography there are two primary types of ciphers: substitution ciphers and transposition ciphers. Substitution ciphers change, or substitute, characters within
Code Breaking
Background
In classic cryptography there are two primary types of ciphers: substitution ciphers and transposition ciphers.
Substitution ciphers change, or substitute, characters within the message while transposition ciphers rearrange the characters in a message.
For example, a caesar cipher is a substitution cipher while reversing a message is a type of transposition cipher.
Given a sufficiently long encrypted text, we can determine whether the text was encrypted via a substitution or transposition cipher by using frequency analysis.
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