Under the condition of a discrete logarithm problem,S2 is decrypted by the OPE(Oblivious Polynomial Evaluation) protocol and Lagrange Interpolation Polynomial(scheme 2).

• 在离散对数困难问题的条件下；利用不经意多项式估值协议和拉格朗日插值多项式来解密S2(方案2).