rotatingcipher
nounUK /rəʊˈteɪtɪŋ ˈsaɪfə/
US /ˈroʊteɪtɪŋ ˈsaɪfər/
A rotating cipher is a secret code where the letters shift by a different amount each time.
The spies used a rotating cipher so their messages were harder to crack.
OTHER MEANINGS
2. A cipher that changes its key after each letter or word.
A rotating cipher keeps changing the key, so patterns are hard to spot.
3. A code system that cycles through several alphabets in order.
The rotating cipher cycled through five alphabets before starting over.
4. A method of encoding where the shift value rotates through a fixed sequence.
With a rotating cipher, the shift might go 1, 2, 3, then back to 1.