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Generate Poseidon params for the secp256k1 base field

sh ./k256_params.sh

Parameters

We use the following parameters for our Poseidon instantiation (using the notation from the Neptune specification). Security inequalities are checked in security_inequalities.sage.

M=128
t=3
p=0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f
Rf=8
Rp=56
a=5