Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-22T15:02:53Z No. of bitstreams: 1 RayronVictorMedeirosDeAraujo_DISSERT.pdf: 4039405 bytes, checksum: 1fdfbf6dd2e57fcc334017f7a3ee24ab (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-27T00:08:32Z (GMT) No. of bitstreams: 1 RayronVictorMedeirosDeAraujo_DISSERT.pdf: 4039405 bytes, checksum: 1fdfbf6dd2e57fcc334017f7a3ee24ab (MD5) / Made available in DSpace on 2016-07-27T00:08:32Z (GMT). No. of bitstreams: 1 RayronVictorMedeirosDeAraujo_DISSERT.pdf: 4039405 bytes, checksum: 1fdfbf6dd2e57fcc334017f7a3ee24ab (MD5) Previous issue date: 2016-02-18 / At? pouco tempo atr?s o uso de biometria se restringia a ambientes de alta seguran?a e aplica??es de identifica??o criminal por raz?es de natureza econ?mica e tecnol?gica. Contudo, nos ?ltimos anos a autentica??o biom?trica come?ou a fazer parte do dia a dia das pessoas. Desde ent?o, alguns problemas de autentica??o entraram em evid?ncia, como a impossibilidade de votar numa elei??o porque o indiv?duo n?o tinha sua impress?o digital reconhecida. Isso acontece, pois os usu?rios de um sistema biom?trico podem ter diferentes graus de acur?cia, principalmente em sistemas de utiliza??o em larga escala. Alguns desses usu?rios podem ter dificuldade na autentica??o, enquanto outros podem ser, particularmente, vulner?veis ? imita??o. Estudos recentes investigaram e identificaram esses tipos de usu?rios, dando-lhes nomes de animais: Sheep, Goats, Lambs, Wolves, Doves, Chameleons, Worms e Phantoms. O objetivo desse trabalho ? avaliar a exist?ncia desses tipos de usu?rios em uma base de dados de impress?es digitais e propor uma nova forma de investig?-los, baseando-se no desempenho das verifica??es entre amostras. Nossos resultados identificaram a presen?a de goats, lambs, wolves, chameleons e phantoms, al?m de demonstrar a aus?ncia de worms e doves, em um sistema biom?trico proposto. / Until recently the use of biometrics was restricted to high-security environments and criminal identification applications, for economic and technological reasons. However, in recent years, biometric authentication has become part of daily lives of people. The large scale use of biometrics has shown that users within the system may have different degrees of accuracy. Some people may have trouble authenticating, while others may be particularly vulnerable to imitation. Recent studies have investigated and identified these types of users, giving them the names of animals: Sheep, Goats, Lambs, Wolves, Doves, Chameleons, Worms and Phantoms. The aim of this study is to evaluate the existence of these users types in a database of fingerprints and propose a new way of investigating them, based on the performance of verification between subjects samples. Once introduced some basic concepts in biometrics and fingerprint, we present the biometric menagerie and how to evaluate them.