The object of this invention is a method for securing an electronic document. In particular, this invention relates to a method that prevents the forging of documents in which an electronic chip is incorporated. To that end, the invention proposes a method in which the data on the document medium are associated with a fingerprint of the document, so as to make them inseparable. That fingerprint is determined on the basis of measurable physical units of the electronic chip or the medium. Thus, the invention allows the combination of the physical protection of the document and the protection of the chip so as to reinforce the security of said documents.