Conjugation Key-Based Conjugation

Engine.conjugate(ciphertext, conjugation_key)

Returns the conjugate of the input ciphertext. Requires a conjugation key if x is a ciphertext.

• Input:
  • Ciphertext
  • ConjugationKey
• Output:
  • Ciphertext

from desilofhe import Engine

engine = Engine()
secret_key = engine.create_secret_key()
public_key = engine.create_public_key(secret_key)
conjugation_key = engine.create_conjugation_key(secret_key)

message = [1, 2, 3]
ciphertext = engine.encrypt(message, public_key)
conjugated_ciphertext = engine.conjugate(ciphertext, conjugation_key)

The levels of the input and output ciphertexts are usually equal. However, if the level of the input ciphertext is at the maximum possible value for a given parameter set, the level of the output ciphertext is reduced by one.

Plaintext Conjugation

Engine.conjugate(plaintext)

Returns the conjugate of the input plaintext.

• Input:
  • Plaintext
• Output:
  • Plaintext

from desilofhe import Engine

engine = Engine()

message = [1, 2, 3]
plaintext = engine.encode(message)
conjugated_plaintext = engine.conjugate(plaintext)