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About Ciphers
A substitution cipher is a method of encrypting by which units of plaintext are replaced with ciphertext, according to a fixed system.
Common Types:
- Caesar Cipher: Shifts each letter by a fixed number of positions
- Atbash Cipher: Maps each letter to its reverse in the alphabet
- Keyword Cipher: Uses a keyword to create the substitution alphabet
- Pigpen Cipher: Uses symbols derived from a grid to replace letters
Historical Use:
Substitution ciphers have been used for thousands of years, from Julius Caesar's military communications to simple puzzles and games today.
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