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The difference is how the plaintext-ciphertext pairs that the attacker has access to are generated. In a chosen plaintext attack, the attacker chooses some plaintext and is handed the corresponding ciphertext. In other words, the attacker may encrypt arbitrary messages. In a chosen ciphertext attack, the attacker can additionally (a chosen ciphertext ...


In chosen plain-text attacks the adversary can obtain the encryption of plain-texts of its choice. In chosen cipher-text attacks can obtain the decryption of any cipher-text (Katz & Lindell, 2008). Technically a chosen-ciphertext should be called a chosen-cipher text and plain text attack (Ferguson, Schneier, & Kohno, 2010) however, that name would ...

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