Create a fully homomorphic encryption context

High-level constructor that creates a CryptoContext with sensible defaults. PKE, KEYSWITCH, and LEVELEDSHE features are enabled automatically.

Usage

fhe_context(scheme = c("BFV", "BGV", "CKKS"), ..., features = NULL)

Arguments

scheme: Character: "BFV", "BGV", or "CKKS".
...: Scheme-specific CCParams setter arguments. Forwarded to BFVParams(), BGVParams(), or CKKSParams(). Example: fhe_context("BFV", plaintext_modulus = 65537, multiplicative_depth = 2) or fhe_context("CKKS", multiplicative_depth = 4, scaling_mod_size = 50, scaling_technique = ScalingTechnique$FLEXIBLEAUTO).
features: Additional Feature values to enable on the context beyond the default PKE|KEYSWITCH|LEVELEDSHE triple.

Value

A CryptoContext object.

Details

All scheme-specific CCParams setter arguments are accepted via ... and forwarded to the appropriate per-scheme constructor (BFVParams(), BGVParams(), or CKKSParams()). See those functions' argument lists for the valid per-scheme setter surface — each scheme accepts only the setters that are not disabled in its upstream CCParams<T> specialization. Passing an invalid scheme-specific argument produces an R-level "unused argument" error at the underlying *Params() call site.

Examples

## An exact context over the integers modulo 65537 (BFV). The ring
## dimension is chosen for you from the security level.
bfv <- fhe_context("BFV", plaintext_modulus = 65537L,
                   multiplicative_depth = 2L)
ring_dimension(bfv)
#> [1] 8192

## An approximate context over the reals (CKKS), which is what the
## statistical applications use.
ckks <- fhe_context("CKKS", multiplicative_depth = 2L,
                    scaling_mod_size = 50L, batch_size = 8L)
ring_dimension(ckks)
#> [1] 16384