Method and system for normalizing biometric variations to authenticate users from a public database and that ensures individual biometric data privacy
US6038315A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1997 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Mar 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3239
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A password system comprises a set of codewords spaced apart from one another by a Hamming distance (HD) that exceeds twice the variability that can be projected for a series of biometric measurements for a particular individual and that is less than the HD that can be encountered between two individuals. To enroll an individual, a biometric measurement is taken and exclusive-ORed with a random codeword to produce a "reference value." To verify the individual later, a biometric measurement is taken and exclusive-ORed with the reference value to reproduce the original random codeword or its approximation. If the reproduced value is not a codeword, the nearest codeword to it is found, and the bits that were corrected to produce the codeword to it is found, and the bits that were corrected to produce the codeword are also toggled in the biometric measurement taken and the codeword generated during enrollment. The correction scheme can be implemented by any conventional error correction code such as Reed-Muller code R(m,n). In the implementation using a hand geometry device an R(2,5) code has been used in this invention. Such codeword and biometric measurement can then be used to see if…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.