Key clustering is a cryptographic condition that occurs when different cryptographic keys generate the same ciphertext from the same plaintext message.
Key clustering is a cryptographic phenomenon that occurs when different encryption keys generate the same ciphertext from the same plaintext message.
A key clustering is a cryptographic weakness where a plaintext message produces the same ciphertext using the same algorithm but with different keys. Secure cryptographic algorithms should normally generate different ciphertext of a given plaintext when using different cryptovariables or keys.