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This the most useful post from Nick's answer so copying here: Since no one really answered the question: AES is only resistant to known-text attacks if you always use a different randomized initialization vector (IV) for every single message. To oversimplify a bit, AES combines the Key with the IV to produce the cipher, and the cipher is rotated in blocks ...


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Just the most basic research on this site would have told you, the answer is NO. From all known cryptanalysis on AES, the answer is simply there are no useful plain-text attacks. (Which is essentially what your "cribs" are. It's not going to be possible to break AES-256 in your clients scenario. Full key recovery is out the picture even with a terrible ...


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Does the length of the public key imply the length of the private key, or can they be unrelated? Yes. The sizes of public and private keys depend on the cryptosystem. Usually they are related somehow, but not necessarily. For example, you can store a short value as a private key, which is then used as a PRNG seed to generate the private key used in the ...



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