How does GCM work?

C

CallMeYourDaddy2020-09-20 13:27:48

Cryptography

CallMeYourDaddy, 2020-09-20 13:27:48

How does GCM work?

Why is this thing secure and why can't we recover the key in it?
Auth tag is the same value of the polynomial at the point H=E(0^128), in the simplest case, linear, with known coefficients. Why can't we then find H by solving a linear equation?

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