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by Dylan16807
717 days ago
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My reaction was "Huh? What multiplication?" The answer is that we're treating this as a Galois field/finite field of order 2^128 with the reducing polynomial (2^128 + 0b10000111). Under that framework, the left shift and possible XOR implement multiplication by 2. (An example of general multiplication here: https://en.wikipedia.org/wiki/Finite_field_arithmetic#Progra...) |
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