Key clustering
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In cryptography, key clustering is said to occur when two different keys generate the same ciphertext from the same plaintext, using same cipher algorithm. A good cipher algorithm, using different keys on the same plaintext, should generate a different ciphertext, irrespective of the key length.
Assume that there is a plaintext P, two different keys, K1 and K2, and an algorithm A. Ciphertexts C1 and C2 with the two keys are generated as follows:
P ----> A(K1 )----> C1
P ----> A(K2) ----> C2
C1 should not equal C2.
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