Chosen-plaintext attack

Attack model for cryptanalysis with presumed access to ciphertexts for chosen plaintexts / From Wikipedia, the free encyclopedia

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A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker can obtain the ciphertexts for arbitrary plaintexts.[1] The goal of the attack is to gain information that reduces the security of the encryption scheme.[2]

Modern ciphers aim to provide semantic security, also known as ciphertext indistinguishability under chosen-plaintext attack, and they are therefore, by design, generally immune to chosen-plaintext attacks if correctly implemented.