eval_automorphism: Apply an automorphism to a ciphertext

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

Apply an automorphism to a ciphertext

Description

Evaluates the automorphism at the given index on ct using the eval-key map returned by eval_automorphism_key_gen(). The result is a new ciphertext whose decrypted slot vector is a permutation of ct's slot vector (the permutation determined by the automorphism group element).

Usage

eval_automorphism(ct, index, eval_key_map)

Arguments

ct	A Ciphertext.
index	Integer; the automorphism index (must match one of the indices passed to eval_automorphism_key_gen()).
eval_key_map	An EvalKeyMap from eval_automorphism_key_gen().

Value

A transformed Ciphertext.

See Also

eval_automorphism_key_gen(), eval_rotate()

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