Face presentation attack detection (PAD) has received increasing attention ever since the vulnerabilities to spoofing have been widely recognized. The state of art in unimodal and multi-modal face anti-spoofing assessed eight international competitions organized conjunction with major biometrics computer vision conferences 2011, 2013, 2017, 2019, 2020 2021, each introducing new challenges resea...

IP addresses are an important tool for fighting spam, used for safe lists, blackhole lists, anti-spoofing and related purposes. While it is trivial to find the sender’s IP address in most email server software, it turns out to be surprisingly difficult to do so in email client software: we explain why. This implies that either alternative approaches are needed (typically signature-based) or tha...

This work exposes a largely unexplored vector of physical-layer attacks with demonstrated consequences in automobiles. By modifying the physical environment around analog sensors such as Antilock Braking Systems (ABS), we exploit weaknesses in wheel speed sensors so that a malicious attacker can inject arbitrary measurements to the ABS computer which in turn can cause lifethreatening situations...

Though having achieved some progresses, the hand-crafted texture features, e.g., LBP [23], LBP-TOP [11] are still unable to capture the most discriminative cues between genuine and fake faces. In this paper, instead of designing feature by ourselves, we rely on the deep convolutional neural network (CNN) to learn features of high discriminative ability in a supervised manner. Combined with some...

A synchronous GNSS generator spoofer aims at directly taking over the tracking loops of receiver with lowest possible spoofing to signal ratio (SSR) without forcing it lose lock. This paper investigates factors that affect success and their relationships. The necessary conditions for successful are obtained by deriving code error in presence analyzing effects SSR, synchronization errors, settin...

Reliability of Automatic Speaker Verification (ASV) systems has always been a concern in dealing with spoofing attacks. Among these attacks, replay attack is the simplest and the easiest accessible method. This paper describes a replay spoofing detection system applied to ASVspoof2017 corpus. To reach this goal, features such as Constant-Q Cepstral Coefficients (CQCC), Modified Group Delay (MGD...