multiply_matrix

Engine.multiply_matrix(matrix, ciphertext, rotation_key)

Returns the product of a matrix with a ciphertext. Consumes a level.

• Input:
  • matrix: A Python list or numpy array. Data types supported include int, double, and complex double.
    • The matrix should be a Engine.slot_count by Engine.slot_count matrix.
  • Ciphertext
  • Rotation key
• Output:
  • Ciphertext

Examples

import numpy as np

from desilofhe import Engine

engine = Engine(slot_count=64)
secret_key = engine.create_secret_key()
rotation_key = engine.create_rotation_key(secret_key)

matrix = np.arange(64 * 64).reshape(64, 64)

message = [2] * 64
ciphertext = engine.encrypt(message, secret_key)

multiplied = engine.multiply_matrix(
    matrix, ciphertext, rotation_key
)  # [4032., 12224., 20416., 28608., ...]

Engine.multiply_matrix(plain_matrix, ciphertext, matrix_multiplication_key)

Returns the prodcut of a plain matrix with a ciphertext. Consumes a level. This function is not supported in multiparty computation.

• Input:
  • PlainMatrix
  • Ciphertext
  • MatrixMultiplicationKey
• Output:
  • Ciphertext

Examples

import numpy as np

from desilofhe import Engine

engine = Engine(slot_count=64)
secret_key = engine.create_secret_key()
matrix_multiplication_key = engine.create_matrix_multiplication_key(secret_key)

matrix = np.arange(64 * 64).reshape(64, 64)
plain_matrix = engine.encode_to_plain_matrix(matrix)

message = [2] * 64
ciphertext = engine.encrypt(message, secret_key)

multiplied = engine.multiply_matrix(
    plain_matrix, ciphertext, matrix_multiplication_key
)  # [4032., 12224., 20416., 28608., ...]