LoDen: Making Every Client in Federated Learning a Defender Against the Poisoning Membership Inference Attacks
Mengyao Ma, Yanjun Zhang, M.A.P. Chamikara, Leo Yu Zhang, Mohan Baruwal Chhetri, Guangdong Bai · 2023
Federated learning (FL) is a widely used distributed machine learning framework. However, recent studies have shown its susceptibility to poisoning membership inference attacks (MIA). In MIA, adversaries maliciously manipulate the local updates on selected samples and share the gradients with the server (i.e., poisoning). Since honest clients perform gradient descent on samples locally, an adversary can distinguish whether the attacked sample is a training sample based on observation of the change of the sample’s prediction. This type of attack exacerbates traditional passive MIA, yet the defense mechanisms remain largely unexplored.