The attacker can specify his own plain text and encrypt or sign it.

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Chosen Plaintext Attacks

Assuming the ability to launch Chosen Plaintext Attacks (CPA), how many oracle calls an attacker needs to break the affine cipher? and how
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Indistinguishability CPA and CCA2

I am study security notions in two lecture and I am cofusing with the concepts IND-CCA and IND-CPA2. About IND-CCA in wikipedia say Indistinguishability under chosen ciphertext attack/adaptive chosen ...