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Wojciech Czaja

4 accepted papers

2023

Decepticons: Corrupted Transformers Breach Privacy in Federated Learning for Language Models

ICLR 2023poster

Privacy is a central tenet of Federated learning (FL), in which a central server trains models without centralizing user data. However, gradient updates used in FL can leak user information. While the most industrial uses of FL are for text applications (e.g. keystroke prediction), the majority of…

2022

Robbing the Fed: Directly Obtaining Private Data in Federated Learning with Modified Models

ICLR 2022poster

Federated learning has quickly gained popularity with its promises of increased user privacy and efficiency. Previous works have shown that federated gradient updates contain information that can be used to approximately recover user data in some situations. These previous attacks on user privacy…

2021

Adversarial Examples Make Strong Poisons

NeurIPS 2021poster

The adversarial machine learning literature is largely partitioned into evasion attacks on testing data and poisoning attacks on training data. In this work, we show that adversarial examples, originally intended for attacking pre-trained models, are even more effective for data poisoning than rece…

2021

Witches' Brew: Industrial Scale Data Poisoning via Gradient Matching

ICLR 2021poster

Data Poisoning attacks modify training data to maliciously control a model trained on such data. In this work, we focus on targeted poisoning attacks which cause a reclassification of an unmodified test image and as such breach model integrity. We consider a particularly malicious poisoning attack t…