Quantization effects in biometric systems

F.M.J. Willems, T. Ignatenko
2009 2009 Information Theory and Applications Workshop  
The fundamental secret-key rate vs. privacy-leakage rate trade-offs for secret-key generation and transmission for i.i.d. Gaussian biometric sources are determined. These results are the Gaussian equivalents of the results that were obtained for the discrete case by the authors and independently by Lai et al. in 2008 . Also the effect that binary quantization of the biometric sequences has on the ratio of the secret-key rate and privacy-leakage rate is considered. It is shown that the squared
more » ... rrelation coefficient must be increased by a factor of π 2 /4 to compensate for such a quantization action, for values of the privacy-leakage rate that approach zero, when the correlation coefficient is close to zero.
doi:10.1109/ita.2009.5044973 fatcat:47lkpohvhvgtrm7xazxmcpkh7m