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Adaptive chosen-ciphertext attack
An adaptive-chosen-ciphertext attack (abbreviated as CCA2) is an interactive form of chosen-ciphertext attack in which an attacker sends a number of ciphertexts to be decrypted, then uses the results of these decryptions to select subsequent ciphertexts. It is to be distinguished from an indifferent-chosen-ciphertext attack (CCA1).
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