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This is a type of chosen-plaintext attack, where the adversary gets partial choice of plaintexts — they can cause the same substring to be encrypted multiple times. AES-CTR, if used properly, is resistant to chosen-plaintext attacks. Used properly, for CTR mode, means that the same counter value must not be reused for different messages. For example, if ...


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Basically there are two ways: decode the counter to be a big number in some kind of library, increase that number, then encode it back as unsigned, statically sized, big endian value, making sure you left pad with zero valued bytes when necessary; increase the value of the right-most byte (highest index) as unsigned number, if the resulting value is zero ...



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