Added information about the required minimum bit length of the public
key. Removed the threshold information as we are not sure now if it's
valid. We'll investigate it separately and make sure a proper validation
for threshold is made.
Instead of passing safe prime bit length which is a kind of an
implementation detail, we should pass a public key bit length. Public
key is a Paillier modulus defining plaintext space. This information is
more important than the safe prime value/bit length used under the hood.
`4` and `120*time.Seconds` were just some magic numbers in the code.
We decided to move them to separate value declarations to make the
code more self-explanatory.
Piotr Dyraga