SECONDARY ELEMENTS IN A FUZZY VAULT ENCODING SCHEME

摘要

The description relates in particular to a method for encoding information represented in the form of a function P, and to a corresponding method for decoding information. The encoding comprises the encoding of secondary information. These methods may be implemented within a context of biometric enrollment and (respectively) biometric authentication. The description also relates to an electronic device, a computer program, and a storage medium for the implementation of such methods.

主权项

1. A method for encoding information represented in the form of a function P, comprising:
/a/ obtaining, by an encoding electronic circuit (ENC), respective indexes of K main elements (VIC1, VIC2, . . . VICK), each corresponding to an element of an indexed set of N possible elements, in this indexed set of N possible elements, /b/ obtaining, by the encoding electronic circuit (ENC), K secondary elements (ANG1, ANG2, . . . ANGK) respectively associated with the K main elements (VIC1, VIC2, . . . VICK), each secondary element (ANG1, ANG2, . . . ANGK) being able to assume s values, /c/ generating, by the encoding electronic circuit (ENC), an indexed set of R encoded elements comprising K encoded main elements, R being an integer between K+1 and N, using the function P and an injective function TR having as a starting set the set of the N indexes of the indexed set of N possible elements and having as a target set the starting set of function P with the starting set of function TR removed, generating an encoded element of index i of the indexed set of R encoded elements comprising generating s+1 components (E_VICi, E_ANG1,i, E_ANG2,i, . . . E_ANGs,i), namely:
/c1/ when the index i is not equal to any of the indexes of the K main elements (VIC1, VIC2, . . . VICK) in the indexed set of N possible elements, generating, by the encoding electronic circuit (ENC), s+1 simulated components, and/c2/ when the index i is equal to the index of one (VICj) of the K main elements (VIC1, VIC2, . . . VICK) in the indexed set of N possible elements,
/c2A/ generating, by the encoding electronic circuit (ENC), an encoded main element in the form of a component (E_VICi) equal to P(i) at a first defined position of the generated components,/c2B/ generating, by the encoding electronic circuit (ENC), a component (E_ANGf(ANGj),i) obtained using P(TR(i)) at a second defined position of the generated components, the second defined position being a function of the secondary element (ANGj) corresponding to the main element (VICj) whose index in the indexed set of N possible elements is the index i, and/c2C/ generating, by the encoding electronic circuit (ENC), s−1 simulated components (E_ANG1,i, E_ANG2,i, . . . E_ANGf(ANGj)−1,i, E_ANGf(ANGj)+1,i, . . . E_ANGs,i).