Haojin Zhu

Fake reviews tell no tales? Dissecting click farming in content-generated social networks

2017

Recently, there has been a radial shift from traditional online social networks to content-generated social networks (CGSNs). Contemporary CGSNs, such as Dianping and TripAdvisor, are often the targets of click farming in which fake reviews …

Dynamic Traffic Feature Camouflaging via Generative Adversarial Networks

2019

Traffic analysis attacks, including website fingerprinting and protocol fingerprinting, are widely adopted by Internet censorship to block a specific type of traffic. To mitigate these attacks, some advanced approaches such as traffic morphing and protocol …

Understanding and Detecting Mobile Ad Fraud Through the Lens of Invalid Traffic

2021

Along with gaining popularity of Real-Time Bidding (RTB) based programmatic advertising, the click farm based invalid traffic, which leverages massive real smartphones to carry out large-scale ad fraud campaigns, is becoming one of the major …