VERSION

# Modifications on version 2

## High-level
A shell script is now used to launch parameter generation. 

It considers the following high-level parameters:
* plaintext modulus
* politics (discussed below)
* circuit multiplicative depth
* desired security level
* BKZ reduction cost model

## Politics
They describe different approaches to define default parameters in different implementations.
Different implementations adopt different strategies, priorities, default behaviors.
There are currently three possible values : Cingulata_BFV, SEAL_BFV, FV_NFLlib.
Details are given in the file defaultParam.sh


## Low-level
New parameters are considered during parameter generation:
* plaintext modulus t (default value: 2)
* private key distribution D_SK (default value: ((0,1),63))
* parameters compatible with Regev security-reduction or not (default value: "yes"). This impact Gaussian noise width value.
* modulus level to respect (SEAL version <= 3.2, resp. FV-NFLlib) additional constraints on ciphertext modulus bitsize  (sum of multiples of 30,40,50, resp. multiple of bitsize of used type (uint16_t, uint32_t, uint64_t) to store polynomial coefficient minus 2). 

During database generation, each of these parameters impacts different objectives: 
* Correction(t,noise_Gaussian_width)
* Security(D_SK,noise_Gaussian_witdh)