Ciphers invented before the era of computers and modern cryptographic theory. Classical ciphers typically operate on letters instead of bits and are usually designed to be implemented by hand or using simple mechanical devices.

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Question on mono-alphabetic substitution cipher and poly-alphabetic substitution cipher

You know that a meaningful plaintext in a language with a 26-letter alphabet, like English, is encrypted using either the mono-alphabetic substitution cipher or the poly-alphabetic substitution cipher ...