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{{expert}}
In [[cryptography]], '''key clustering''' is said to occur when two different [[key (cryptography)|keys]] generate the same [[ciphertext]] from the same [[plaintext]], using the 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:
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'''P → A(K2) → C2'''
C1 should not equal C2, if they do then key clustering has occurred.
==Importance==
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