Abstract: The invention concerns a method for dynamic management of a database, wherein the data, stored in storage means, are designed to be ordered through ordering means according to at least one database structure comprising at least one field for receiving at least one data. The invention is characterized in that it consists in declaring, through information means, a field of said structure based on the characteristics of said data as said data are being introduced.

Abstract: The invention concerns a method for authenticating a user via a terminal (1) connected to a network (2) and comprising means (4) for reading a medium (3), wherein, when said support (3) is created, identifying data (5) concerning said user are recorded on the medium (3) by etching means and on storage means (6); data (7) concerning the etching of said medium (3) are collected and stored in the form of a trace via said storage means (6), said trace indexing random errors occurring during etching; and, wherein, when said medium (3) is used, said identifying data (5) are read and transmitted via secure connection means (8) to said remote storage means (6) via said network (2) for comparing and authenticating same.