Biometric-enrolment method implemented in a chip card comprising a biometric sensor, an enrolment module and a memory, the method comprising an iterative process comprising, during at least one current iteration: - biometric enrolment by the enrolment module implementing a biometric-enrolment function, comprising: ∘ acquiring at least one first biometric print by means of the biometric sensor; and ∘ recording, by way of reference biometric data (DREF), in the memory, first biometric data obtained from each first biometric print acquired; - biometric-enrolment verification, comprising: ∘ acquiring at least one second biometric print by means of the biometric sensor; and ∘ verifying 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 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 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 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 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 by the enrolment module implementing a biometric-enrolment function, comprising: ∘ acquiring at least one first biometric print by means of the biometric sensor; and ∘ recording, by way of reference biometric data (DREF), in the memory, first biometric data obtained from each first biometric print acquired; ∘ acquiring at least one first biometric print by means of the biometric sensor; and ∘ recording, by way of reference biometric data (DREF), in the memory, first biometric data obtained from each first biometric print acquired; - biometric-enrolment verification, comprising: ∘ acquiring at least one second biometric print by means of the biometric sensor; and ∘ verifying the validity of the reference biometric data by comparing them with the second biometric data obtained from each second biometric print acquired; ∘ acquiring at least one second biometric print by means of the biometric sensor; and ∘ verifying 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 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 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 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;