The invention relates to the area of wireless physical layer security. Specifically, the invention relates to a systematic concatenated coding scheme based on the combination of interleaving with powerful channel codes and possible use of jamming for wireless secrecy under the practical assumption of codes in the finite blocklength regime against an eavesdropper, while granting reliable transmission between legitimate transmitter and receiver. It comprises a method in which a random key K is generated (202), to be interleaved (204) with a message M to be sent, being that key K is in parallel encoded with an outer code (203), and the interleaved message and the encoded key are concatenated (205). The concatenated block is subsequently encoded with an inner code (206), consequently producing codeword X (220), which is transmitted wirelessly (221). This method grants granting reliable transmission between legitimate transmitter and receiver. Jamming may also be emitted simultaneously (222), therefore providing an advantage for a receiving device against a possible eavesdropper.