In October 2016, Google Brain designed an experiment to determine that neural networks are capable of learning secure symmetric encryption.[13] In this experiment, three neural networks were created: Alice, Bob and Eve.[14] Adhering to the idea of a generative adversarial network (GAN), the goal of the experiment was for Alice to send an encrypted message to Bob that Bob could decrypt, but the adversary, Eve, could not.[14] Alice and Bob maintained an advantage over Eve, in that they shared a key used for encryption and decryption.[13] In doing so, Google Brain demonstrated the capability of neural networks to learn secure encryption.[13]