BGV12,論文:(Leveled) Fully Homomorphic Encryption without Bootstrapping
密鑰交換
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- 矩陣\(A_{N*n_2}\)
- 矩陣\(B_{N*n_2}\):“矩陣\(A\)+\(powersof2(s_1)\)”,具體爲:
- 所以\(B.s_2=(2e_2+Powersof2(s_1))\):
- 應該是:\(\mathbf{c}_2=B^T\cdot \mathsf{BitDecomp}(\mathbf{c}_1)\):其中\(\mathsf{BitDecomp}(\mathbf{c_1)}\)大小爲\(N*1\),\(B\)大小爲\(N*n_2\)