Abstract: A device for secure short-range point-to-point radiocommunication, comprising: first transceiver apparatus for transmission and/or reception of a first EM beam with a non-zero Orbital Angular Momentum OAM value (l10); additional transceiver apparatus for transmission and/or reception of at least one additional EM beam which is co-polar and isofrequential with the first beam that can be generated by the first apparatus and with value (l20; l30) of the topological charge of the OAM different from the OAM topological charge value (l10) of the beam transmittable and/or receivable by the first transceiver apparatus; a first and a second data channel being associated with a respective carrier comprising said first and said at least second EM beam, respectively, thereby forming a high-security physical substrate preventing interception of the radiocommunication information content; wherein the device is included: in a security card, or in a reader device for a security card, or in a portable multimedia device, or in