A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis in which the cryptanalyst can gather information by obtaining the decryptions of chosen ciphertexts. From those pieces of information, the adversary can attempt to recover the secret key used for decryption.

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Facts from Wikidata (CC0).

chosen-ciphertext attack

cryptanalytic attack model where the attacker gathers information by obtaining the decryptions of chosen ciphertexts.

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