changing-keycipher
nounA changing-key cipher is a secret code where the key changes as you go, so the same letter can be hidden in different ways.
The spy used a changing-key cipher so that each word of the message was scrambled with a different key.
SYNONYMS
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OTHER MEANINGS
2. A cipher whose key is updated after every letter or block, making patterns harder to spot.
Because it was a changing-key cipher, the repeated letters in the message did not look repeated.
3. A coding method where the secret key follows a rule, such as moving forward one step each time.
In the changing-key cipher, the key moved forward one letter for every character encoded.
4. A way of hiding messages in which the key is not fixed for the whole message.
The puzzle used a changing-key cipher, so solvers had to work out a new key for each part.