同态加密 Homomorphic Encryption

技术进展

-Gentry 原始版本 somewhat HE+bootstrapping
-第二代：Leveled somewhat HE(modulus switching) + bootstrapping
-BGV(for high degree polynomials), NTRU
-scale-invariant: FV, YASHE(for low level, large plaintext polynomials, weak instance in Eurocrypt 2016)
-第三代：without key switching
–GSW
–optimization: packed ciphertext/ bootstrapping with polynomial noise

行业进展

Microsoft : SEAL lib

-based on YASHE
-自动参数生成：利用乘法和加法的噪声，对同态加密的结果进行噪声仿真
-没有slot switch

IBM : HElib

-based on BGV