simplesubstitutioncipher
nounUK /ˈsɪmpəl ˌsʌbstɪˈtjuːʃən ˈsaɪfə/
US /ˈsɪmpəl ˌsʌbstɪˈtuːʃən ˈsaɪfər/
A simple substitution cipher is a secret code where each letter is swapped for a different letter.
The children used a simple substitution cipher to write secret messages to each other.
SYNONYMS
OTHER MEANINGS
2. A cipher that replaces each plaintext letter with a fixed different letter throughout the message.
In a simple substitution cipher, every A might become an M.
3. A beginner-level code used in puzzles and classroom activities.
The puzzle book included a simple substitution cipher for kids to solve.
4. A method of hiding text by consistently swapping letters according to a key.
They cracked the simple substitution cipher by noticing the most common letter.