a_1, a_2 are uniformly sampled polynomials

KEY GENERATION
- Sample polynomials s, e_1, e_2 according to the discrete Gaussian distribution
- Check e_1 and e_2: reject if \sum{k=1}{w} max_k(e_i) is greater than L for at least one
- sk = (s, e_1, e_2), pk = (t_1, t_2) = (a_1 * s + e_1, a_2 * s + e_2)

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