| 摘要 |
The invention relates to an enrolment method for enrolling biometric data in a database, each data item comprising an information vector on a biometric feature, and a mask vector, determining those bits of the information vector to be taken into account for data comparison, the method comprising the application of permutation to the bits of the vectors, the method being characterized in that it further comprises a step to encode the vectors using an enrolment code, the permutation being applied to the encoded vectors, and the said encoding comprising: the representation of each bit of the mask vector in a sequence of several bits, such that the mean weight of the representations of all the bits of the mask vector is constant or statistically constant irrespective of the values of the bits of the mask vector; and the representation of each bit of the information vector in a sequence comprising at least one bit drawn randomly, the randomly drawn bits following the same law of distribution as the bits of the information vector. The invention also relates to a database, and a data acquisition method comprising encoding said data for comparison thereof with data in the base. |
