TF PJC

TF PJC provides a bridge between TensorFlow and Google’s Private Join and Compute library. This allows two parties to privately compute the intersection of two sets and the sum of associated values as described in IKNP+’19.

Usage

The library may be used as shown in the following example:

import tensorflow as tf
import tf_pjc
# device strings of the two players involved
client_device = "/job:localhost/task:0/device:CPU:0"
server_device = "/job:localhost/task:1/device:CPU:0"
# construct private input of server
with tf.device(server_device):
  server_elements = tf.constant(["a", "b", "c"])
# construct private inputs of client
with tf.device(client_device):
  client_elements = tf.constant(["a", "b", "c", "d"])
  client_values   = tf.constant([100, 200, 400, 800])
# use protocol to securely compute intersection size and sum
protocol_instance = tf_pjc.PrivateIntersectionSum(client_device, server_device)
client_result_op, server_wait_op = protocol_instance(client_elements, client_values, server_elements)
# print private result (which is local to the client)
with tf.device(client_device):
  intersection_size, intersection_sum = client_result_op
  print_size_op = tf.print("Intersection size: ", intersection_size)
  print_sum_op = tf.print("Intersection sum: ", intersection_sum)
  print_op = tf.group(print_size_op, print_sum_op)
# run in TensorFlow session
with tf.Session() as sess:
  sess.run([print_op, server_wait_op])

Future releases will also include the possibility of using TF PJC in conjunction with TF Encrypted as a kernel for tfe.sets.intersection_sum.

Installation

Python 3 packages are available from PyPI:

pip install tf-pjc