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Which of the following best describes AES?
It has a block size of 64 bits, with key sizes of 32, 64, or 128 bits
It has a block size of 128 bits, with key sizes of 64, 128, or 256 bits
It has a block size of 128 bits, with key sizes of 128, 192, or 256 bits
AES is a symmetric encryption algorithm, with a block size of 128 bits, and key sizes of 128, 192, or 256 bits. AES is the de facto symmetric encyrption standard. EDIT deleted duplicate answer.
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