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AES is a state-of-the-art, well designed block cipher generally assumed to be and modeled as a pseudo-random permutation. Which means in CBC mode it is resistant to known plain text attack and if IV is unpredictable for next cipher text, it is considered indistinguishable under chosen plaintext attack (unless there is some mathematical breakthrough in ...


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Isn't this painfully obvious? I look at this and I know exactly where the IV ends and the encrypted string begins. That's OK. The IV is not a secret, and an attacker does not gain any advantage by knowing which bytes in the payload contain the IV and which bytes contain the ciphertext. With other encryption tools, it is well-known how the IV is stored ...


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Generally you'd just use RSA with OAEP padding if you want to encrypt a key. Your question however talks about exchange a key. That could also be performed using RSA-KEM. Note that RSA was often used with TLS to provide key exchange using the RSA_ cipher suites. That RSA key was part of a trusted certificate, so it also performed entity authentication. ...


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