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A cipher is a process that obscures a message and encodes it, making the message obscured and not
understandable if intercepted. The intended recipient of the message then decodes it which then
reveals the message. (1)
A character cipher replaces one character with another. They're simple to use but relatively easy to
crack. For example, with any reasonably large message, you can count the letters in the ciphertext
and guess the substitution using frequency tables for letters in the English language. (1) The
symbols are passed in plaintext. Character ciphers are not used in modern cryptography as they are
easy to solve.
Block ciphers group a predetermined count of characters into a block, and then encode the entire
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