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This paper presents a human verification scheme in two independent stages to overcome the vulnerabilities of attacks and to enhance security. At the first stage, a hand image-based CAPTCHA (HandCAPTCHA) is tested to avert automated…

Computer Vision and Pattern Recognition · Computer Science 2024-10-15 Asish Bera , Debotosh Bhattacharjee , Hubert P H Shum

A biometric recognition system can operate in two distinct modes: identification or verification. In the first mode, the system recognizes an individual by searching the enrolled templates of all the users for a match. In the second mode,…

Cryptography and Security · Computer Science 2024-02-22 Axel Durbet , Paul-Marie Grollemund , Kevin Thiry-Atighehchi

Purpose of the research: In the biometric community, visible human characteristics are popular and viable for verification and identification on mobile devices. However, imposters are able to spoof such characteristics by creating fake and…

Computer Vision and Pattern Recognition · Computer Science 2021-12-09 Jalil Nourmohammadi Khiarak

Document Presentation Attack Detection (DPAD) is an important measure in protecting the authenticity of a document image. However, recent DPAD methods demand additional resources, such as manual effort in collecting additional data or…

Computer Vision and Pattern Recognition · Computer Science 2024-11-25 Changsheng Chen , Yongyi Deng , Liangwei Lin , Zitong Yu , Zhimao Lai

Near Field Communication (NFC) cards are widely used for identification, but their passive nature often limits the ability to incorporate additional security mechanisms. As a result, anyone holding the card may be incorrectly recognized as…

Signal Processing · Electrical Eng. & Systems 2026-04-21 Dickson Akuoko Sarpong , Hongzhi Guo

Website Fingerprinting attacks enable a passive eavesdropper to recover the user's otherwise anonymized web browsing activity by matching the observed traffic with prerecorded web traffic templates. The defenses that have been proposed to…

Cryptography and Security · Computer Science 2016-07-20 Marc Juarez , Mohsen Imani , Mike Perry , Claudia Diaz , Matthew Wright

Device fingerprinting is a widely used technique that allows a third party to identify a particular device. Applications of device fingerprinting include authentication, attacker identification, or software license binding. Device…

Cryptography and Security · Computer Science 2023-09-18 Alberto Fernandez-de-Retana , Igor Santos-Grueiro

Face anti-spoofing algorithms play a pivotal role in the robust deployment of face recognition systems against presentation attacks. Conventionally, full facial images are required by such systems to correctly authenticate individuals, but…

Computer Vision and Pattern Recognition · Computer Science 2024-08-26 Vaibhav Sundharam , Abhijit Sarkar , A. Lynn Abbott

Many widely used Internet messaging and calling apps, such as WhatsApp, Viber, Telegram, and Signal, have deployed an end-to-end encryption functionality. To defeat potential MITM attackers against the key exchange protocol, the approach…

Cryptography and Security · Computer Science 2017-07-18 Maliheh Shirvanian , Nitesh Saxena , Jesvin James George

Recently, significant progress has been made in face presentation attack detection (PAD), which aims to secure face recognition systems against presentation attacks, owing to the availability of several face PAD datasets. However, all…

Computer Vision and Pattern Recognition · Computer Science 2023-04-12 Meiling Fang , Marco Huber , Naser Damer

A non-vector-based dissimilarity measure is proposed by combining vector-based distance metrics and set operations. This proposed compound dissimilarity measure (CDM) is applicable to quantify similarity of collections of attribute/feature…

Applications · Statistics 2018-06-27 Caifa Zhou , Andreas Wieser

Liveness Detection (LivDet) is an international competition series open to academia and industry with the objec-tive to assess and report state-of-the-art in Presentation Attack Detection (PAD). LivDet-2023 Noncontact Fingerprint is the…

Presentation attack is a challenging issue that persists in the security of automatic fingerprint recognition systems. This paper proposes a novel explainable residual slim network that detects the presentation attack by representing the…

Computer Vision and Pattern Recognition · Computer Science 2023-06-08 Anuj Rai , Somnath Dey

The main scope of this chapter is to serve as an introduction to face presentation attack detection, including key resources and advances in the field in the last few years. The next pages present the different presentation attacks that a…

Computer Vision and Pattern Recognition · Computer Science 2021-11-29 Javier Hernandez-Ortega , Julian Fierrez , Aythami Morales , Javier Galbally

Automatic methods for detecting presentation attacks are essential to ensure the reliable use of facial recognition technology. Most of the methods available in the literature for presentation attack detection (PAD) fails in generalizing to…

Computer Vision and Pattern Recognition · Computer Science 2021-10-04 Anjith George , Sebastien Marcel

Fingerprint recognition systems, which rely on the unique characteristics of human fingerprints, are essential in modern security and verification applications. Accurate minutiae extraction, a critical step in these systems, depends on the…

Computer Vision and Pattern Recognition · Computer Science 2026-03-20 Raffaele Cappelli

Presentation attacks are recurrent threats to biometric systems, where impostors attempt to bypass these systems. Humans often use background information as contextual cues for their visual system. Yet, regarding face-based systems, the…

Computer Vision and Pattern Recognition · Computer Science 2021-11-23 Pedro C. Neto , Ana F. Sequeira , Jaime S. Cardoso

Model fingerprinting is a widely adopted approach to safeguard the intellectual property rights of open-source models by preventing their unauthorized reuse. It is promising and convenient since it does not necessitate modifying the…

Cryptography and Security · Computer Science 2025-08-12 Shuo Shao , Haozhe Zhu , Yiming Li , Hongwei Yao , Tianwei Zhang , Zhan Qin

Presentation attacks are posing major challenges to most of the biometric modalities. Iris recognition, which is considered as one of the most accurate biometric modality for person identification, has also been shown to be vulnerable to…

Computer Vision and Pattern Recognition · Computer Science 2020-10-27 Mehak Gupta , Vishal Singh , Akshay Agarwal , Mayank Vatsa , Richa Singh

Iris presentation attack detection (PAD) plays a vital role in iris recognition systems. Most existing CNN-based iris PAD solutions 1) perform only binary label supervision during the training of CNNs, serving global information learning…

Computer Vision and Pattern Recognition · Computer Science 2021-06-29 Meiling Fang , Naser Damer , Fadi Boutros , Florian Kirchbuchner , Arjan Kuijper
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