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Aegis256X4Mac
The Aegis256X4Mac message authentication function has a 256-bit key size,
and outputs 256 bit tags.
The key size is the main practical difference with Aegis128X4Mac.
AEGIS' large state, non-linearity and non-invertibility provides the
following properties:
256 bit security against forgery.
Recovering the secret key from the state would require ~2^256 attempts,
which is infeasible for any practical adversary.
It has a large security margin against internal collisions.
