Encrypt a plaintext

encrypt dispatches on both the key type and the plaintext. The (PublicKey, Plaintext) method performs public-key encryption and is the canonical path used by every vignette. The (PrivateKey, Plaintext) method performs symmetric / secret-key encryption using the private key directly; it is useful in protocols that want the secret key to serve as both encryption and decryption key (e.g. one-party tests, single-user benchmarks).

Usage

encrypt(key, pt, ...)

Arguments

key

A PublicKey or PrivateKey.

pt

A Plaintext.

...

Additional arguments (cc = CryptoContext is required).

Value

A Ciphertext.

Examples

cc <- fhe_context("CKKS", multiplicative_depth = 2L,
                  scaling_mod_size = 50L, batch_size = 8L)
kp <- key_gen(cc, eval_mult = TRUE)
pt <- make_ckks_packed_plaintext(cc, c(0.5, 1.5, 2.5, 3.5))

## Public-key encryption -- the usual path, and the one that lets a
## party encrypt without holding the secret key:
ct <- encrypt(kp@public, pt, cc = cc)
ct
#> <Ciphertext> [active]

## Symmetric encryption with the secret key, for protocols where the
## same party encrypts and decrypts:
ct2 <- encrypt(kp@secret, pt, cc = cc)
ct2
#> <Ciphertext> [active]