Simplify the following text for a Grade 14 native English-speaking person.
Original: A ( full ) adaptive chosen-ciphertext attack is an attack in which ciphertexts may be chosen adaptively before and after a challenge ciphertext is given to the attacker , with only the stipulation that the challenge ciphertext may not itself be queried .
Simplified: A ( full ) adaptive chosen-ciphertext attack is an attack in which ciphertexts may be chosen adaptively before and after a challenge ciphertext is given to the attacker , with ONE condition that the challenge ciphertext may not itself be queried .