Base types and algorithms

There are a couple of base types used around all the FHE-enabled applications. You can check this section or jump directly into our examples and figure out everything through experience.

Remember: if you have any questions not covered on this page - feel free to ping us on our Discord server.

Cryptography schemes supported

We currently support three so-called PKE schemes:

• CKKS

• BFV

• BGV

Many of our methods and algorithms contain the suffix referring to the scheme used. This section provides examples.

Params

The Params policy type stores flags and parameters for the FHE algorithms to use.

There are different ways to generate a Params type instance, but the main way is to create a mutable object by calling GenParams%scheme_name% and setting the options after that. For the CKKS scheme, it will be GenParamsCKKSRNS.

CryptoContext

CryptoContext type, as its name stands, stores the metadata of your FHE context. You usually create its instance using one of the following functions:

• By generating the CryptoContext directly - ffi::DCRTPolyGenCryptoContextByParams%scheme_name%

• By deserializing a CryptoContext generated somewhere else - ffi::DCRTPolyDeserializeCryptoContextFromFile