Unicity distance

Unicity distance is a concept in cryptography that refers to the minimum amount of ciphertext required to ensure that a given ciphertext corresponds to exactly one possible plaintext. In other words, it is the length of ciphertext needed to guarantee that there is a unique plaintext that could produce that ciphertext using a particular encryption scheme. In contexts like symmetric encryption, the unicity distance is important for assessing the security of a cryptosystem.