SEAL

Is there a library for homomorphic encryption that application devs can use? Is it practical to use this technology yet? Edit: I found this library from Microsoft but it only supports addition and multiplication, not comparisons and sorting so it seems it’s not practical yet: https://github.com/microsoft/SEAL#microsoft-seal-1

FHE is undergoing standardization right now. The leading algorithm candidates are based on lattice crypto which is currently quantum-safe: https://homomorphicencryption.org/ Here are some mature and actively-developed HE libraries: https://github.com/homenc/HElib (By IBM, employed the inventor of FHE) https://github.com/Microsoft/SEAL (Best tutorials) https://palisade-crypto.org/software-library (High-quality codebase) https://github.com/tfhe/tfhe (Fast boolean logic, used by Cingulata) Good introductory material is hard to come by, but I like the first half of this talk: https://simons.berkeley.edu/talks/intro-fhe-and-tfhe

It seems to implement enough operators to be interesting, such as basic math operations and 'plain text addition' (will have to try it out to know what it means). It also made me discover Microsoft SEAL (https://github.com/microsoft/SEAL), which I find to be an interesting initiative

One interesting application of NTT polynomial multiplication is in fully-homomorphic encryption libraries, such as Microsoft's SEAL [1], where the ciphertexts are polynomials of very high degree. (Disclaimer: I work at MSR using SEAL for machine learning.) [1]: https://github.com/Microsoft/SEAL