Federated learning is particularly susceptible to model poisoning and backdoor attacks because individual users have direct control over the training data and model updates. At the same time, the attack power of an individual user is limited because their updates are quickly drowned out by those of many other users. Existing attacks do not account for future behaviors of other users, and thus require many sequential updates and their effects are quickly erased. We propose an attack that anticipates and accounts for the entire federated learning pipeline, including behaviors of other clients, and ensures that backdoors are effective quickly and persist even after multiple rounds of community updates. We show that this new attack is effective in realistic scenarios where the attacker only contributes to a small fraction of randomly sampled rounds and demonstrate this attack on image classification, next-word prediction, and sentiment analysis.

在联邦学习中，我们提出了一种利用攻击者对未来其他客户端的行为，实现后门快速生效并且持续存在的攻击方法，该攻击方法适用于图像分类、下一个单词预测和情感分析等应用。

深谋远虑：预测他人行动在联邦学习中提升后门攻击