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Do Chosen-Chiphertext attacks (CCA-1/2) only apply to public-key Cryptosystem?

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No, there are also CCA games for private key encryption schemes. There you have additional encryption oracles that you can use, to obtain encryptions for messages of your choice (in a private key encryption scheme you can not encrypt yourself, because this requires the secret key). See here for a concise explanation and comparison: http://crypto.cs.uiuc.edu/wiki/index.php/IND-CCA

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