Varieties of Chosen-ciphertext Attacks
Chosen-ciphertext attacks, like other attacks, may be adaptive or non-adaptive. In a non-adaptive attack, the attacker chooses the ciphertext or ciphertexts to decrypt in advance, and does not use the resulting plaintexts to inform their choice for more ciphertexts. In an adaptive chosen-ciphertext attack, the attacker makes their ciphertext choices adaptively, that is, depending on the result of prior decryptions.
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