create_individual_fixed_rotation_key

Engine.create_individual_fixed_rotation_key(secret_key, public_key, delta, level)
Create an individual fixed rotation key, which is used to create a common fixed rotation key for a specific delta amount of rotation in multiparty computation. Requires a secret key and a public key.
  • Input:
    • SecretKey
    • PublicKey
    • delta: int. It is generated by modulo operation within the range [0~slot count).
    • level: int, optional
      • Creates the key with a reduced size to contain only the specified multiplication levels.
  • Output:
    • FixedRotationKey

Warning

  • The matrix form does not support this operation.
from desilofhe import Engine

engine = Engine(multiparty=True)
secret_key1 = engine.create_secret_key()
secret_key2 = engine.create_secret_key()
public_key_a = engine.create_public_key_a()
public_key_b1 = engine.create_public_key_b(secret_key1, public_key_a)
public_key_b2 = engine.create_public_key_b(secret_key2, public_key_a)

public_key = engine.create_multiparty_public_key(
    [public_key_b1, public_key_b2], public_key_a
)

fixed_rotation_key1 = engine.create_individual_fixed_rotation_key(
    secret_key1, public_key, delta=1
)

level_3_fixed_rotation_key1 = engine.create_individual_fixed_rotation_key(
    secret_key1, public_key, delta=1, level=3
)