Addition of 0 and 1 in the Galois Field 2 is just like exclusive-or.
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def encrypt(p,k): return p+k
from GF2 import one
k = one
p = one
c = encrypt(p, k)
print c
Now, suppose an eavesdropper Eve, observes the value of c.
So, let's suppose the secret key is chosen by flipping a coin.
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So, you can see in this case, you could effectively double the throughput from this source to these two recipients using GF2 addition.
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本文标题：coding the matrix week1 GF(2)
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