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Security Evaluation of i-Vector Based Speaker Verification Systems Against Hill-Climbing Attacks
BibTeX
@MISC{Gomez-barrero_securityevaluation,
author = {Marta Gomez-barrero and Javier Gonzalez-dominguez and Javier Galbally and Joaquin Gonzalez-rodriguez},
title = {Security Evaluation of i-Vector Based Speaker Verification Systems Against Hill-Climbing Attacks},
year = {}
}
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Abstract
This work studies the vulnerabilities of i-vector based speaker verification systems against indirect attacks. Particularly, we exploit the one-to-one representation of speakers via their corresponding i-vectors to perform Hill-Climbing based attacks; under the hypothesis that the inherent low-dimensionality of i-vectors might represent a potential security breach to fraudulently access the system. The conducted attacks followed a standard experimental protocol already applied to other biometric systems based on face or signature; and they were tested against a state-of-art PLDA speaker verification system in the framework of the NIST SRE 2010 evaluation campaign. Specifically, up to 200 speakers, 100 female and 100 male, were attacked supplanting their corresponding i-vectors by those derived with the Hill-Climbing approach. Experiments show the success of the proposed attack compared with those based on brute force, achieving high Success Rates (up to 100%) and needing half as many comparisons as the brute force access attempts. These results evidence the vulnerability of i-vector based speaker verification systems in those scenarios where access to the matcher score is granted multiple times. As a countermeasure to minimize the effect of the attack score quantization is also evaluated. Index Terms: speaker verification, i-vector, security, hillclimbing. 1.
Keyphrases
security evaluation speaker verification system hill-climbing attack speaker verification system corresponding i-vectors index term nist sre one-to-one representation inherent low-dimensionality many comparison hill-climbing approach attack score quantization speaker verification brute force work study biometric system high success rate standard experimental protocol indirect attack matcher score multiple time brute force access attempt conducted attack result evidence potential security breach evaluation campaign state-of-art plda speaker verification system
