Processing Biometric Data in a Multidimensional Coordinate System
First Claim
1. A method of processing biometric data relating to a biological part, in a biometric system having, on the one hand, at least one set of reference biometric data resulting from the application of an “
- exclusive or”
operation between a first set of biometric data and a first encoded key and, on the other hand, a piece of information relating to the first key;
said method comprising the following steps;
(a) obtaining a second set of biometric data;
(b) determining a second encoded key by applying an “
exclusive or”
operation between the set of reference biometric data and the second set of biometric data;
(c) decoding said second key; and
(d) deciding whether the second set of biometric data corresponds to the first set of biometric data by comparing the information relating to the first key with the second key;
wherein said first and second sets of biometric data are expressed in a multidimensional coordinate system of N dimensions, N being an integer greater than or equal to 2, the biometric data along at least one of said N dimensions being obtained by a plurality of processes applied in relation to said biological part; and
wherein said first encoded key is obtained by applying an encoding transforming an initial word of a predetermined length into a word coded in said multidimensional coordinate system.
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Abstract
The invention concerns a biometric system provided with a set of reference biometric data (B′i) resulting from the application of a disjunction between a first set of biometric data (Bi) and a first encoded key (Ki), and from an information concerning the first key. A second set of biometric data (B2) is obtained. A second encoded key is determined by using a disjunction between the set of reference biometric data and the second set of biometric data. The second key is decoded by iterative decoding. Then, it is determined whether the first and second sets of biometric data mutually correspond by comparing the information concerning the first key with the second key. The first and second sets of biometric data are expressed in a multidimensional repository with N dimensions, the biometric data according to at least one of the N dimensions being obtained by using processes relative to the biometric part; and the first encoded key is obtained by using an encoding transforming an initial word of specific length into an encoded word in the multidimensional repository.
63 Citations
12 Claims
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1. A method of processing biometric data relating to a biological part, in a biometric system having, on the one hand, at least one set of reference biometric data resulting from the application of an “
- exclusive or”
operation between a first set of biometric data and a first encoded key and, on the other hand, a piece of information relating to the first key;said method comprising the following steps; (a) obtaining a second set of biometric data; (b) determining a second encoded key by applying an “
exclusive or”
operation between the set of reference biometric data and the second set of biometric data;(c) decoding said second key; and (d) deciding whether the second set of biometric data corresponds to the first set of biometric data by comparing the information relating to the first key with the second key; wherein said first and second sets of biometric data are expressed in a multidimensional coordinate system of N dimensions, N being an integer greater than or equal to 2, the biometric data along at least one of said N dimensions being obtained by a plurality of processes applied in relation to said biological part; and wherein said first encoded key is obtained by applying an encoding transforming an initial word of a predetermined length into a word coded in said multidimensional coordinate system. - View Dependent Claims (2, 3, 4, 5, 6)
- exclusive or”
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7. A device for processing biometric data relating to a biological part in a biometric system, said processing device having, on the one hand, at least one set of reference biometric data resulting from the application of an “
- exclusive or”
operation between a first set of biometric data and a first encoded key and, on the other hand, a piece of information relating to the first key;said device comprising; an interface unit designed to receive a second set of biometric data; a determination unit designed to provide a second encoded key by applying an “
exclusive or”
operation between the set of reference biometric data and the second set of biometric data received by said interface unit;a decoding unit designed to decode the second encoded key; and a decision unit designed to decide whether the second set of biometric data corresponds to the first set of biometric data by comparing the information relating to the first key with the second key; wherein said first and second sets of biometric data are expressed in a multidimensional coordinate system of N dimensions, N being an integer greater than or equal to 2, the biometric data along at least one of said N dimensions being obtained by a plurality of processes applied in relation to said biological part; and wherein said first encoded key is obtained by applying an encoding transforming an initial word of a predetermined length into a word coded in said multidimensional coordinate system. - View Dependent Claims (8, 9, 10, 11, 12)
- exclusive or”
Specification