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Black-Box Adversarial Attack on Public Face Recognition Systems

Geekpwn CAAD (Competition on Adversarial Attacks and Defenses) 2018, is a competition that inherits the format of NIPS CAAD 2017, plus some new challenges. In October 2018, me and Cihang Xie were invited to Geekpwn CAAD CTF, a live competition with different types of adversarial attacks and defenses.

This CAAD CTF features a new challenge that asks teams to attack an unknown face recognition system. During the 30 minutes phase 1 competition, we were given an image of the competition moderator Chang-Jian Jiang. We need to make small modifications to the image, in order to fool the face recognition system to recognize it as Arnold Schwarzenegger. After the competition, we learned that the system we attacked was AWS Celebrity Recognition API.

This repo contains code and several results of such attacks.

Some Results

During the competition, we successfully attacked AWS to recognize Chang-Jian Jiang as Schwarzenegger:

AWS-JCJ

The following one is slightly harder (lower success rate with varying random seeds), probably because: (1) both source and target are American celebrities. (2) different gender

AWS-Trump

Apparently, Azure Vision API and Clarifai Celebrity Recognition can be fooled as well:

Azure-Trump

Clarifai-JCJ

Original and adversarial versions of the above images can be found at images/. You can download them and try on the public APIs.

Preparation to Use the Code

  1. Install TensorFlow ≥ 1.7

  2. Follow steps 1-4 in facenet wiki to setup facenet

  3. Clone this repo and uncompress the pre-trained model inside:

git clone https://github.com/ppwwyyxx/Adversarial-Face-Attack
cd Adversarial-Face-Attack
wget https://github.com/ppwwyyxx/Adversarial-Face-Attack/releases/download/v0.1/model-20180402-114759.tar.bz2
tar xjvf model-20180402-114759.tar.bz2

You can also download the model from facenet.

  1. Validate the model and the dataset:
./face_attack.py --data /path/to/lfw_mtcnnpy_160 --validate-lfw
# /path/to/lfw_mtcnnpy_160 is obtained above in step #4 in facenet wiki.

It should print a high accuracy on LFW, like:

Accuracy: 0.99517+-0.00361
Validation rate: 0.97467+-0.01454 @ FAR=0.00067

Run attack

./face_attack.py --data /path/to/lfw_mtcnnpy_160 \
	--attack images/clean-JCJ.png \
	--target Arnold_Schwarzenegger \
	--output JCJ-to-Schwarzenegger.png

--target has to be a person which has many images (the more the better) in the LFW dataset. Such person can be found by:

find /path/to/lfw_mtcnnpy_160/ -type f -printf "%h\0" | \
    xargs -0 -L1 basename | sort | uniq -c | sort -k1 -n

You can add new celebrities as victims in the LFW directory, or add additional images for existing celebrities in LFW. After adding new images, you'll need to repeat step 4 in facenet wiki, to crop and align the images you add.

Note that the attack contains randomness: you'll not get the same output every time.

Disclaimer

  1. This work is only for computer vision research. Please do not use it for illegal purposes.

  2. This work has no relationship with the authors' schools or employers.

  3. It turns out after a year, AWS is no longer vulnerable to my attack.

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