A secure access control method using: - a reader, of the secure access control reader type, comprising a control module in connection with a remote processing unit, and further comprising a first radiocommunication module having a first range and a second radiocommunication module having a second range less than the first range; - at least one radiocommunication mobile terminal carried by a user, where said mobile terminal comprises: - a first radiocommunication chip capable of establishing a first radiocommunication channel with the first radiocommunication module of the reader if said mobile terminal is located at a distance from the reader less than the first range, and - a second radiocommunication chip capable of establishing a second radiocommunication channel with the second radiocommunication module if said mobile terminal is located at a distance from the reader less than the second range; said secure access control method comprising an authentication phase during which the mobile terminal communicates to the control module of the reader authenticated identification data specific to said mobile terminal and towards the remote processing unit; said secure access control method implementing at least two modes of operation: - a first mode of operation wherein the mobile terminal is located at a distance from the reader less than the first range and greater than the second range, and wherein the first radiocommunication chip of the mobile terminal establishes a radiocommunication in the first radiocommunication channel with the first radiocommunication module of the reader in order to exchange identification data in this first radiocommunication channel between the mobile terminal and the control module of the reader during or subsequently to the authentication phase; and - a second mode of operation wherein the mobile terminal is located at a distance from the reader less than the second range, and wherein the second radiocommunication chip of the mobile terminal establishes as a priority and automatically a radiocommunication in the second radiocommunication channel with the second radiocommunication module of the reader in order to exchange identification data in this second radiocommunication channel between the mobile terminal and the control module of the reader during or subsequently to the authentication phase, where this second radiocommunication channel is selected automatically and as a matter of priority by the mobile terminal for this radiocommunication over the first radiocommunication channel. - a reader, of the secure access control reader type, comprising a control module in connection with a remote processing unit, and further comprising a first radiocommunication module having a first range and a second radiocommunication module having a second range less than the first range; - at least one radiocommunication mobile terminal carried by a user, where said mobile terminal comprises: - a first radiocommunication chip capable of establishing a first radiocommunication channel with the first radiocommunication module of the reader if said mobile terminal is located at a distance from the reader less than the first range, and - a second radiocommunication chip capable of establishing a second radiocommunication channel with the second radiocommunication module if said mobile terminal is located at a distance from the reader less than the second range; - a first radiocommunication chip capable of establishing a first radiocommunication channel with the first radiocommunication module of the reader if said mobile terminal is located at a distance from the reader less than the first range, and - a second radiocommunication chip capable of establishing a second radiocommunication channel with the second radiocommunication module if said mobile terminal is located at a distance from the reader less than the second range; - a first mode of operation wherein the mobile terminal is located at a distance from the reader less than the first range and greater than the second range, and wherein the first radiocommunication chip of the mobile terminal establishes a radiocommunication in the first radiocommunication channel with the first radiocommunication module of the reader in order to exchange identification data in this first radiocommunication channel between the mobile terminal and the control module of the reader during or subsequently to the authentication phase; and - a second mode of operation wherein the mobile terminal is located at a distance from the reader less than the second range, and wherein the second radiocommunication chip of the mobile terminal establishes as a priority and automatically a radiocommunication in the second radiocommunication channel with the second radiocommunication module of the reader in order to exchange identification data in this second radiocommunication channel between the mobile terminal and the control module of the reader during or subsequently to the authentication phase, where this second radiocommunication channel is selected automatically and as a matter of priority by the mobile terminal for this radiocommunication over the first radiocommunication channel.