we choose AES cipher in the randomized counter mode with a key space effectively limited to 24 bits.
Specifically, the key has the following format (in hex): 80 00 … 00 XX XX XX , where X is an arbitrary hex number.
In other words, the first 13 bytes of the key are fixed to be zeroes (except that the first bit is fixed to be “1”), and the last 3 bytes can be arbitrary (so that they need to be checked by exhaustive search).
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