Secured document with a contactless chip with protection of data against unauthorised access

The present invention relates to a folding axis, at least one sheet which can be folded over (8) (5, 7) of the booklet (booklet) security in the form document (1), the document is, the transponder antenna 9 and the data the electronic chip is provided with a memory for storing a security document relates to a transponder having one (11). Said article being different from the transponder antenna 9 different from, if the document is opened, the antenna allows the communication of the document and the remote reader amplifies the electromagnetic flux that is received by the transponder antenna 9 and wherein in the closed position of the document, the antenna is the document image so as to decrease below the minimum threshold to allow communication of the electromagnetic flux remote reader and the electronic chip (11) received by the transponder antenna 9 It disposed on, and a foldable antenna amplifier (3), characterized in that it further comprises.