re_key_gen: Proxy re-encryption

In openfhe.R: R Interface to the 'OpenFHE' Fully Homomorphic Encryption Library

Proxy re-encryption

Description

re_key_gen() makes a re-encryption key from one party's secret key and another party's public key. With it, re_encrypt() turns a ciphertext under the first party's key into one the second party can decrypt, without decrypting it. The context needs Feature$PRE.

Usage

re_key_gen(cc, old_private_key, new_public_key)

re_encrypt(ct, eval_key, public_key = NULL)

Arguments

cc	A CryptoContext.
old_private_key	The PrivateKey the ciphertexts are currently encrypted under.
new_public_key	The PublicKey of the party who is to decrypt.
ct	A Ciphertext.
eval_key	The EvalKey from re_key_gen().
public_key	The PublicKey of the party the ciphertext is currently encrypted for, or NULL (default). It is used to re-randomize the result in the security modes that require it.

Value

re_key_gen() returns an EvalKey; re_encrypt() a Ciphertext.

openfhe.R documentation built on Nov. 13, 2026, 5:07 p.m.