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forensics

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Code Implementation for Traceback of Data Poisoning Attacks in Neural Networks

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# Traceback of Data Poisoning Attacks in Neural Networks
### ABOUT

This repository contains code implementation of the paper "[Poison Forensics: Traceback of Data Poisoning Attacks in Neural Networks](https://sandlab.cs.uchicago.edu/forensics/)", at *USENIX Security 2022*. 
This traceback tool for poison data is developed by researchers at [SANDLab](https://sandlab.cs.uchicago.edu/), University of Chicago.

### Note
The code base currently only supports the CIFAR10 dataset and BadNets attack. Adapting to new datasets is possible by editing the data loading and model loading code.

### DEPENDENCIES

Our code is implemented and tested on Keras with TensorFlow backend. The following packages are used by our code.

- `keras==2.4.3`
- `numpy==1.19.5`
- `tensorflow==2.4.1`

Please make sure to install the exact TensorFlow version.

Our code is tested with `Python 3.6.8`

### Steps to train a backdoored model and run traceback

This code base includes code to train a backdoored model and traceback code to identify malicious data points from the training set.

#### Step 1: Train/download backdoor model

To train a backdoored model, simply run:

`python3 inject_backdoor.py --config cifar2 --gpu 0`

The `--config` argument will load a config file under the `config` directory. Feel free to modify the config file for a different set of parameters. `--gpu` argument will specify which GPU to use. We do not recommend running this code on CPU-only machines.

#### Step 2: Run traceback

Running traceback leverages two scripts. `gen_embs.py` will generate the embedding needed for clustering and `run_traceback.py` performs traceback using generated embeddings and unlearning.

First, run `python3 gen_embs.py --config cifar2 --gpu 0` to generate embedding, which will be saved under `results/`. Then run `python3 run_traceback.py --config cifar2 --gpu 0`. It should perform clustering and pruning. The unlearning process will be printed out. In the end, it will output the final precision and recall.

#### Things to keep in mind when adapting to a new dataset/model

- During unlearning process, make sure to set the training parameters identical to the ones used during the initial model training. This includes augmentation, learning rate, and optimizers. If you found the unlearning process to be unstable, please reduce the learning rate or add gradient clipping. If the issue persists, please reach out to us via shawnshan@cs.uchicago.edu.

### Citation
```
@inproceedings{shan2022poison,
  title={Poison Forensics: Traceback of Data Poisoning Attacks in Neural Networks},
  author={Shan, Shawn and Bhagoji, Arjun Nitin and Zheng, Haitao and Zhao, Ben Y},
  journal={Proc. of USENIX Security},
  year={2022}
}
```

forensics

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