An Adaptive Chosen-Ciphertext Attack (CCA) is a type of cryptographic attack model where the attacker has the ability to choose ciphertexts and obtain their corresponding plaintexts, potentially multiple times, in a manner that adapts based on the information learned from previous queries. This is a more powerful attack model than a standard chosen-ciphertext attack, as it allows the attacker to refine their strategy based on the feedback received from the decryption of the chosen ciphertexts.
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