| 1. |
- Galbally-Herrero, J., et al.
(författare)
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On the vulnerability of fingerprint verification systems to fake fingerprint attacks
- 2006
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Ingår i: Proceedings. - Piscataway, N.J. : IEEE Press. - 9781424401741 ; , s. 130-136
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Konferensbidrag (refereegranskat)abstract
- A new method to generate gummy fingers is presented. A medium-size fake fingerprint database is described and two different fingerprint verification systems are evaluated on it. Three different scenarios are considered in the experiments, namely: enrollment and test with real fingerprints, enrollment and test with fake fingerprints, and enrollment with real fingerprints and test with fake fingerprints. Results for an optical and a thermal sweeping sensors are given. Both systems are shown to be vulnerable to direct attacks. © 2006 IEEE.
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| 2. |
- Garcia-Salicetti, S., et al.
(författare)
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Biosecure reference systems for on-line signature verification : A study of complementarity
- 2007
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Ingår i: Annales des télécommunications. - : Springer. - 0003-4347 .- 1958-9395. ; 62:1-2, s. 36-61
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present an integrated research study in On-line Signature Verification undertaken by several teams that participate in the BioSecure Network of Excellence. This integrated work, started during the First BioSecure Residential Workshop, has as main objective the development of an On-line Signature Verification evaluation platform. As a first step, four On-line Signature Verification Systems based on different approaches are evaluated and compared following the same experimental protocol on MCYT signature database, which is the largest existing on-line western signature database publicly available with 16 500 signatures from 330 clients. A particular focus of work documented in this paper is multi-algorithmic fusion in order to study the complementarity of the approaches involved. To this end, a simple fusion method based on the Mean Rule is used after a normalization phase.
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| 3. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Exploiting Character Class Information in Forensic Writer Identification
- 2011
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Ingår i: Computational forensics. - Berlin : Springer Berlin/Heidelberg. - 9783642193750 ; , s. 31-42
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Konferensbidrag (refereegranskat)abstract
- Questioned document examination is extensively used by forensic specialists for criminal identification. This paper presents a writer recognition system based on contour features operating in identification mode (one-to-many) and working at the level of isolated characters. Individual characters of a writer are manually segmented and labeled by an expert as pertaining to one of 62 alphanumeric classes (10 numbers and 52 letters, including lowercase and uppercase letters), being the particular setup used by the forensic laboratory participating in this work. Three different scenarios for identity modeling are proposed, making use to a different degree of the class information provided by the alphanumeric samples. Results obtained on a database of 30 writers from real forensic documents show that the character class information given by the manual analysis provides a valuable source of improvement, justifying the significant amount of time spent in manual segmentation and labeling by the forensic specialist. © 2011 Springer-Verlag Berlin Heidelberg.
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| 4. |
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| 5. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Robustness of signature verification systems to imitators with increasing skills
- 2009
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Ingår i: ICDAR '09. - Los Alamitos, Calif. : IEEE Computer Society. - 9780769537252
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study the impact of an incremental level of skill in the forgeries against signature verification systems. Experiments are carried out using both off-line systems, involving the discrimination of signatures written on a piece of paper, and on-line systems, in which dynamic information of the signing process (such as velocity and acceleration) is also available. We use for our experiments the BiosecurID database, which contains both on-line and off-line versions of signatures, acquired in four sessions across a 4 month time span with incremental level of skill in the forgeries for different sessions. We compare several scenarios with different size and variability of the enrolment set, showing that the problem of skilled forgeries can be alleviated as we consider more signatures for enrolment. © 2009 IEEE.
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| 6. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Secure access system using signature verification over Tablet PC
- 2007
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Ingår i: IEEE Aerospace and Electronic Systems Magazine. - Piscataway, N.J. : IEEE Press. - 0885-8985 .- 1557-959X. ; 22:4, s. 3-8
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Tidskriftsartikel (refereegranskat)abstract
- Low-cost portable devices capable of capturing signature signals are being increasingly used. Additionally, the social and legal acceptance of the written signature for authentication purposes is opening a range of new applications. We describe a highly versatile and scalable prototype for Web-based secure access using signature verification. The proposed architecture can be easily extended to work with different kinds of sensors and large-scale databases. Several remarks are also given on security and privacy of network-based signature verification. © 2007 IEEE.
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| 7. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Sensor Interoperability and Fusion in Fingerprint Verification : A Case Study Using Minutiae- and Ridge-based Matchers
- 2006
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Ingår i: 2006 9th International Conference on Control, Automation, Robotics and Vision, Vols 1- 5. - Piscataway, N.J. : IEEE Press. - 9781424403424 ; , s. 422-427
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Konferensbidrag (refereegranskat)abstract
- Information fusion in fingerprint recognition has been studied in several papers. However, only a few papers have been focused on sensor interoperability and sensor fusion. In this paper, these two topics are studied using a multisensor database acquired with three different fingerprint sensors. Authentication experiments using minutiae and ridge-based matchers are reported. Results show that the performance drops dramatically when matching images from different sensors. We have also observed that fusing scores from different sensors results in better performance than fusing different instances from the same sensor. © 2006 IEEE.
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| 8. |
- Bigun, Josef, et al.
(författare)
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Combining Biometric Evidence for Person Authentication
- 2005
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Ingår i: Advanced Studies in Biometrics. - Berlin : Springer Berlin/Heidelberg. - 9783540262046 - 9783540286387 ; , s. 1-18
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Humans are excellent experts in person recognition and yet they do not perform excessively well in recognizing others only based on one modality such as single facial image. Experimental evidence of this fact is reported concluding that even human authentication relies on multimodal signal analysis. The elements of automatic multimodal authentication along with system models are then presented. These include the machine experts as well as machine supervisors. In particular, fingerprint and speech based systems will serve as illustration. A signal adaptive supervisor based on the input biometric signal quality is evaluated.
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| 9. |
- Galbally, J., et al.
(författare)
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Fingerprint Liveness Detection Based on Quality Measures
- 2009
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Ingår i: 2009 1st IEEE International Conference on Biometrics, Identity and Security, BIdS 2009. - Piscataway, N.J. : IEEE Press. - 9781424452767 ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- A new fingerprint parameterization for liveness detection based on quality measures is presented. The novel feature set is used in a complete liveness detection system and tested on the development set of the LivDET competition, comprising over 4,500 real and fake images acquired with three ditTerent optical sensors. The proposed solution proves to be robust to the multi-sensor scenario, and presents an overall rate of 93% of correctly classified samples. Furthermore, the liveness detection method presented has the added advantage over previously studied techniques of needing just one image from a finger to decide whether it is real or fake.
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| 10. |
- Martinez-Diaz, M., et al.
(författare)
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Hill-climbing and brute-force attacks on biometric systems: A case study in Match-on-Card fingerprint verification
- 2006
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Ingår i: Proceedings 2006. - Piscataway, N.J. : IEEE Press. - 9781424401741 ; , s. 151-159
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study the robustness of state-of-theart automatic fingerprint verification systems against hill-climbing and brute-force attacks. We compare the performance of this type of attacks against two different minutiae-based systems, the NIST Fingerprint Image Software 2 (NFIS2) reference system and a Match-on-Card based system. In order to study their success rate, the attacks are analyzed and modified in each scenario. We focus on the influence of initial conditions in hill-climbing attacks, like the number of minutiae in the synthetically generated templates or the performance of each type of modification in the template. We demonstrate how slight modifications in the hill-climbing algorithm lead to very different success rates. © 2006 IEEE.
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