Biometric-enrolment method implemented in a chip card (DV1) comprising a biometric sensor (SR1), an enrolment module (MD2) and a memory (MR2), the method comprising an iterative process comprising, during at least one current iteration: - biometric enrolment (S2) by the enrolment module implementing a biometric-enrolment function (F1), comprising: ∘ acquiring (S4) at least one first biometric print (FP1) by means of the biometric sensor; and ∘ recording (S8), by way of reference biometric data (DREF), in the memory, first biometric data (DT1) obtained from each first biometric print acquired; - biometric-enrolment verification (S20), comprising: ∘ acquiring (S22) at least one second biometric print (FP2) by means of the biometric sensor; and ∘ verifying (S26) the validity of the reference biometric data by comparing them with the second biometric data obtained from each second biometric print acquired; - if the reference biometric data are determined to be valid, blockage (S34) of the enrolment module so as to inhibit the biometric-enrolment function with a view to preventing any subsequent biometric enrolment, the reference biometric data being stored (S36) in the memory with a view to subsequently allowing a biometric authentication; and - if at least one portion of the reference biometric data is determined to be invalid, deletion (S40) of at least said invalid portion of the reference biometric data and triggering of a new biometric enrolment with a view to replacing the deleted biometric data with new biometric data obtained from at least one new biometric print; wherein the chip card interacts with a peripheral device (DV2) comprising an internal power source and a user interface, each biometric enrolment and each biometric-enrolment verification being triggered on detection of the chip card being coupled anew to the peripheral device. - biometric enrolment (S2) by the enrolment module implementing a biometric-enrolment function (F1), comprising: ∘ acquiring (S4) at least one first biometric print (FP1) by means of the biometric sensor; and ∘ recording (S8), by way of reference biometric data (DREF), in the memory, first biometric data (DT1) obtained from each first biometric print acquired; ∘ acquiring (S4) at least one first biometric print (FP1) by means of the biometric sensor; and ∘ recording (S8), by way of reference biometric data (DREF), in the memory, first biometric data (DT1) obtained from each first biometric print acquired; - biometric-enrolment verification (S20), comprising: ∘ acquiring (S22) at least one second biometric print (FP2) by means of the biometric sensor; and ∘ verifying (S26) the validity of the reference biometric data by comparing them with the second biometric data obtained from each second biometric print acquired; ∘ acquiring (S22) at least one second biometric print (FP2) by means of the biometric sensor; and ∘ verifying (S26) the validity of the reference biometric data by comparing them with the second biometric data obtained from each second biometric print acquired; - if the reference biometric data are determined to be valid, blockage (S34) of the enrolment module so as to inhibit the biometric-enrolment function with a view to preventing any subsequent biometric enrolment, the reference biometric data being stored (S36) in the memory with a view to subsequently allowing a biometric authentication; and - if at least one portion of the reference biometric data is determined to be invalid, deletion (S40) of at least said invalid portion of the reference biometric data and triggering of a new biometric enrolment with a view to replacing the deleted biometric data with new biometric data obtained from at least one new biometric print; <EOS>